diff --git a/CHANGELOG.md b/CHANGELOG.md
index b77ceb864..0b521584b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,9 @@
 - Removed support for old, lightwallet based vault. Users who have not opened app in over a month will need to recover with their seed phrase. This will allow Firefox support sooner.
 - Fixed bug where spinner wouldn't disappear on incorrect password submission on seed word reveal.
 - Polish the private key UI.
+- Enforce minimum values for gas price and gas limit.
+- Fix bug where total gas was sometimes not live-updated.
+- Fix bug where editing gas value could have some abrupt behaviors (#1233)
 - Add Kovan as an option on our network list.
 
 ## 3.4.0 2017-3-8
diff --git a/app/scripts/lib/tx-utils.js b/app/scripts/lib/tx-utils.js
index c6814c05f..7988f83e9 100644
--- a/app/scripts/lib/tx-utils.js
+++ b/app/scripts/lib/tx-utils.js
@@ -63,7 +63,7 @@ module.exports = class txProviderUtils {
     const initialGasLimitBn = hexToBn(initialGasLimitHex)
     const blockGasLimitBn = hexToBn(blockGasLimitHex)
     const bufferedGasLimitBn = initialGasLimitBn.muln(1.5)
-    
+
     // if initialGasLimit is above blockGasLimit, dont modify it
     if (initialGasLimitBn.gt(blockGasLimitBn)) return bnToHex(initialGasLimitBn)
     // if bufferedGasLimit is below blockGasLimit, use bufferedGasLimit
@@ -99,7 +99,7 @@ module.exports = class txProviderUtils {
     txParams.from = normalize(txParams.from)
     txParams.value = normalize(txParams.value)
     txParams.data = normalize(txParams.data)
-    txParams.gasLimit = normalize(txParams.gasLimit || txParams.gas)
+    txParams.gas = normalize(txParams.gas || txParams.gasLimit)
     txParams.nonce = normalize(txParams.nonce)
     // build ethTx
     log.info(`Prepared tx for signing: ${JSON.stringify(txParams)}`)
@@ -134,4 +134,4 @@ function bnToHex(inputBn) {
 
 function hexToBn(inputHex) {
   return new BN(ethUtil.stripHexPrefix(inputHex), 16)
-}
\ No newline at end of file
+}
diff --git a/ui/app/actions.js b/ui/app/actions.js
index d02b7dcaa..7288db256 100644
--- a/ui/app/actions.js
+++ b/ui/app/actions.js
@@ -397,7 +397,6 @@ function signTx (txData) {
       dispatch(actions.hideLoadingIndication())
       if (err) return dispatch(actions.displayWarning(err.message))
       dispatch(actions.hideWarning())
-      dispatch(actions.goHome())
     })
     dispatch(this.showConfTxPage())
   }
diff --git a/ui/app/components/hex-as-decimal-input.js b/ui/app/components/hex-as-decimal-input.js
index c89ed0416..e37aaa8c3 100644
--- a/ui/app/components/hex-as-decimal-input.js
+++ b/ui/app/components/hex-as-decimal-input.js
@@ -9,6 +9,7 @@ module.exports = HexAsDecimalInput
 
 inherits(HexAsDecimalInput, Component)
 function HexAsDecimalInput () {
+  this.state = { invalid: null }
   Component.call(this)
 }
 
@@ -23,49 +24,120 @@ function HexAsDecimalInput () {
 
 HexAsDecimalInput.prototype.render = function () {
   const props = this.props
-  const { value, onChange } = props
+  const state = this.state
+
+  const { value, onChange, min, max } = props
+
   const toEth = props.toEth
   const suffix = props.suffix
   const decimalValue = decimalize(value, toEth)
   const style = props.style
 
   return (
-    h('.flex-row', {
-      style: {
-        alignItems: 'flex-end',
-        lineHeight: '13px',
-        fontFamily: 'Montserrat Light',
-        textRendering: 'geometricPrecision',
-      },
-    }, [
-      h('input.ether-balance.ether-balance-amount', {
-        type: 'number',
-        style: extend({
-          display: 'block',
-          textAlign: 'right',
-          backgroundColor: 'transparent',
-          border: '1px solid #bdbdbd',
-
-        }, style),
-        value: decimalValue,
-        onChange: (event) => {
-          const hexString = (event.target.value === '') ? '' : hexify(event.target.value)
-          onChange(hexString)
+    h('.flex-column', [
+      h('.flex-row', {
+        style: {
+          alignItems: 'flex-end',
+          lineHeight: '13px',
+          fontFamily: 'Montserrat Light',
+          textRendering: 'geometricPrecision',
         },
-      }),
-      h('div', {
+      }, [
+        h('input.hex-input', {
+          type: 'number',
+          required: true,
+          min: min,
+          max: max,
+          style: extend({
+            display: 'block',
+            textAlign: 'right',
+            backgroundColor: 'transparent',
+            border: '1px solid #bdbdbd',
+
+          }, style),
+          value: parseInt(decimalValue),
+          onBlur: (event) => {
+            this.updateValidity(event)
+          },
+          onChange: (event) => {
+            this.updateValidity(event)
+            const hexString = (event.target.value === '') ? '' : hexify(event.target.value)
+            onChange(hexString)
+          },
+          onInvalid: (event) => {
+            const msg = this.constructWarning()
+            if (msg === state.invalid) {
+              return
+            }
+            this.setState({ invalid: msg })
+            event.preventDefault()
+            return false
+          },
+        }),
+        h('div', {
+          style: {
+            color: ' #AEAEAE',
+            fontSize: '12px',
+            marginLeft: '5px',
+            marginRight: '6px',
+            width: '20px',
+          },
+        }, suffix),
+      ]),
+
+      state.invalid ? h('span.error', {
         style: {
-          color: ' #AEAEAE',
-          fontSize: '12px',
-          marginLeft: '5px',
-          marginRight: '6px',
-          width: '20px',
+          position: 'absolute',
+          right: '0px',
+          textAlign: 'right',
+          transform: 'translateY(26px)',
+          padding: '3px',
+          background: 'rgba(255,255,255,0.85)',
+          zIndex: '1',
+          textTransform: 'capitalize',
+          border: '2px solid #E20202',
         },
-      }, suffix),
+      }, state.invalid) : null,
     ])
   )
 }
 
+HexAsDecimalInput.prototype.setValid = function (message) {
+  this.setState({ invalid: null })
+}
+
+HexAsDecimalInput.prototype.updateValidity = function (event) {
+  const target = event.target
+  const value = this.props.value
+  const newValue = target.value
+
+  if (value === newValue) {
+    return
+  }
+
+  const valid = target.checkValidity()
+  if (valid) {
+    this.setState({ invalid: null })
+  }
+}
+
+HexAsDecimalInput.prototype.constructWarning = function () {
+  const { name, min, max } = this.props
+  let message = name ? name + ' ' : ''
+
+  if (min && max) {
+    message += `must be greater than or equal to  ${min} and less than or equal to ${max}.`
+  } else if (min) {
+    message += `must be greater than or equal to ${min}.`
+  } else if (max) {
+    message += `must be less than or equal to ${max}.`
+  } else {
+    message += 'Invalid input.'
+  }
+
+  return message
+}
+
 function hexify (decimalString) {
   const hexBN = new BN(decimalString, 10)
   return '0x' + hexBN.toString('hex')
diff --git a/ui/app/components/pending-tx-details.js b/ui/app/components/pending-tx-details.js
deleted file mode 100644
index e92ce575f..000000000
--- a/ui/app/components/pending-tx-details.js
+++ /dev/null
@@ -1,344 +0,0 @@
-const Component = require('react').Component
-const h = require('react-hyperscript')
-const inherits = require('util').inherits
-const extend = require('xtend')
-const ethUtil = require('ethereumjs-util')
-const BN = ethUtil.BN
-
-const MiniAccountPanel = require('./mini-account-panel')
-const EthBalance = require('./eth-balance')
-const util = require('../util')
-const addressSummary = util.addressSummary
-const nameForAddress = require('../../lib/contract-namer')
-const HexInput = require('./hex-as-decimal-input')
-
-module.exports = PendingTxDetails
-
-inherits(PendingTxDetails, Component)
-function PendingTxDetails () {
-  Component.call(this)
-}
-
-const PTXP = PendingTxDetails.prototype
-
-PTXP.render = function () {
-  var props = this.props
-  var state = this.state || {}
-  var txData = state.txMeta || props.txData
-
-  var txParams = txData.txParams || {}
-  var address = txParams.from || props.selectedAddress
-  var identity = props.identities[address] || { address: address }
-  var account = props.accounts[address]
-  var balance = account ? account.balance : '0x0'
-
-  const gas = (state.gas === undefined) ? txParams.gas : state.gas
-  const gasPrice = (state.gasPrice === undefined) ? txData.gasPrice : state.gasPrice
-
-  var txFee = state.txFee || txData.txFee || ''
-  var maxCost = state.maxCost || txData.maxCost || ''
-  var dataLength = txParams.data ? (txParams.data.length - 2) / 2 : 0
-  var imageify = props.imageifyIdenticons === undefined ? true : props.imageifyIdenticons
-
-  log.debug(`rendering gas: ${gas}, gasPrice: ${gasPrice}, txFee: ${txFee}, maxCost: ${maxCost}`)
-
-  return (
-    h('div', [
-
-      h('.flex-row.flex-center', {
-        style: {
-          maxWidth: '100%',
-        },
-      }, [
-
-        h(MiniAccountPanel, {
-          imageSeed: address,
-          imageifyIdenticons: imageify,
-          picOrder: 'right',
-        }, [
-          h('span.font-small', {
-            style: {
-              fontFamily: 'Montserrat Bold, Montserrat, sans-serif',
-            },
-          }, identity.name),
-          h('span.font-small', {
-            style: {
-              fontFamily: 'Montserrat Light, Montserrat, sans-serif',
-            },
-          }, addressSummary(address, 6, 4, false)),
-
-          h('span.font-small', {
-            style: {
-              fontFamily: 'Montserrat Light, Montserrat, sans-serif',
-            },
-          }, [
-            h(EthBalance, {
-              value: balance,
-              inline: true,
-              labelColor: '#F7861C',
-            }),
-          ]),
-
-        ]),
-
-        forwardCarrat(),
-
-        this.miniAccountPanelForRecipient(),
-      ]),
-
-      h('style', `
-        .table-box {
-          margin: 7px 0px 0px 0px;
-          width: 100%;
-        }
-        .table-box .row {
-          margin: 0px;
-          background: rgb(236,236,236);
-          display: flex;
-          justify-content: space-between;
-          font-family: Montserrat Light, sans-serif;
-          font-size: 13px;
-          padding: 5px 25px;
-        }
-        .table-box .row .value {
-          font-family: Montserrat Regular;
-        }
-      `),
-
-      h('.table-box', [
-
-        // Ether Value
-        // Currently not customizable, but easily modified
-        // in the way that gas and gasLimit currently are.
-        h('.row', [
-          h('.cell.label', 'Amount'),
-          h(EthBalance, { value: txParams.value }),
-        ]),
-
-        // Gas Limit (customizable)
-        h('.cell.row', [
-          h('.cell.label', 'Gas Limit'),
-          h('.cell.value', {
-          }, [
-            h(HexInput, {
-              value: gas,
-              suffix: 'UNITS',
-              style: {
-                position: 'relative',
-                top: '5px',
-              },
-              onChange: (newHex) => {
-                log.info(`Gas limit changed to ${newHex}`)
-                this.setState({ gas: newHex })
-              },
-            }),
-          ]),
-        ]),
-
-        // Gas Price (customizable)
-        h('.cell.row', [
-          h('.cell.label', 'Gas Price'),
-          h('.cell.value', {
-          }, [
-            h(HexInput, {
-              value: gasPrice,
-              suffix: 'WEI',
-              style: {
-                position: 'relative',
-                top: '5px',
-              },
-              onChange: (newHex) => {
-                log.info(`Gas price changed to: ${newHex}`)
-                this.setState({ gasPrice: newHex })
-              },
-            }),
-          ]),
-        ]),
-
-        // Max Transaction Fee (calculated)
-        h('.cell.row', [
-          h('.cell.label', 'Max Transaction Fee'),
-          h(EthBalance, { value: txFee.toString(16) }),
-        ]),
-
-        h('.cell.row', {
-          style: {
-            fontFamily: 'Montserrat Regular',
-            background: 'white',
-            padding: '10px 25px',
-          },
-        }, [
-          h('.cell.label', 'Max Total'),
-          h('.cell.value', {
-            style: {
-              display: 'flex',
-              alignItems: 'center',
-            },
-          }, [
-            h(EthBalance, {
-              value: maxCost.toString(16),
-              inline: true,
-              labelColor: 'black',
-              fontSize: '16px',
-            }),
-          ]),
-        ]),
-
-        // Data size row:
-        h('.cell.row', {
-          style: {
-            background: '#f7f7f7',
-            paddingBottom: '0px',
-          },
-        }, [
-          h('.cell.label'),
-          h('.cell.value', {
-            style: {
-              fontFamily: 'Montserrat Light',
-              fontSize: '11px',
-            },
-          }, `Data included: ${dataLength} bytes`),
-        ]),
-      ]), // End of Table
-
-    ])
-  )
-}
-
-PTXP.miniAccountPanelForRecipient = function () {
-  var props = this.props
-  var txData = props.txData
-  var txParams = txData.txParams || {}
-  var isContractDeploy = !('to' in txParams)
-  var imageify = props.imageifyIdenticons === undefined ? true : props.imageifyIdenticons
-
-  // If it's not a contract deploy, send to the account
-  if (!isContractDeploy) {
-    return h(MiniAccountPanel, {
-      imageSeed: txParams.to,
-      imageifyIdenticons: imageify,
-      picOrder: 'left',
-    }, [
-      h('span.font-small', {
-        style: {
-          fontFamily: 'Montserrat Bold, Montserrat, sans-serif',
-        },
-      }, nameForAddress(txParams.to, props.identities)),
-      h('span.font-small', {
-        style: {
-          fontFamily: 'Montserrat Light, Montserrat, sans-serif',
-        },
-      }, addressSummary(txParams.to, 6, 4, false)),
-    ])
-  } else {
-    return h(MiniAccountPanel, {
-      imageifyIdenticons: imageify,
-      picOrder: 'left',
-    }, [
-
-      h('span.font-small', {
-        style: {
-          fontFamily: 'Montserrat Bold, Montserrat, sans-serif',
-        },
-      }, 'New Contract'),
-
-    ])
-  }
-}
-
-PTXP.componentDidUpdate = function (prevProps, previousState) {
-  log.debug(`pending-tx-details componentDidUpdate`)
-  const state = this.state || {}
-  const prevState = previousState || {}
-  const { gas, gasPrice } = state
-
-  // Only if gas or gasPrice changed:
-  if (!prevState ||
-      (gas !== prevState.gas ||
-      gasPrice !== prevState.gasPrice)) {
-    log.debug(`recalculating gas since prev state change: ${JSON.stringify({ prevState, state })}`)
-    this.calculateGas()
-  }
-}
-
-PTXP.calculateGas = function () {
-  const txMeta = this.gatherParams()
-  log.debug(`pending-tx-details calculating gas for ${JSON.stringify(txMeta)}`)
-
-  var txParams = txMeta.txParams
-  var gasCost = new BN(ethUtil.stripHexPrefix(txParams.gas || txMeta.estimatedGas), 16)
-  var gasPrice = new BN(ethUtil.stripHexPrefix(txParams.gasPrice || '0x4a817c800'), 16)
-  var txFee = gasCost.mul(gasPrice)
-  var txValue = new BN(ethUtil.stripHexPrefix(txParams.value || '0x0'), 16)
-  var maxCost = txValue.add(txFee)
-
-  const txFeeHex = '0x' + txFee.toString('hex')
-  const maxCostHex = '0x' + maxCost.toString('hex')
-  const gasPriceHex = '0x' + gasPrice.toString('hex')
-
-  txMeta.txFee = txFeeHex
-  txMeta.maxCost = maxCostHex
-  txMeta.txParams.gasPrice = gasPriceHex
-
-  this.setState({
-    txFee: '0x' + txFee.toString('hex'),
-    maxCost: '0x' + maxCost.toString('hex'),
-  })
-
-  if (this.props.onTxChange) {
-    this.props.onTxChange(txMeta)
-  }
-}
-
-PTXP.resetGasFields = function () {
-  log.debug(`pending-tx-details#resetGasFields`)
-  const txData = this.props.txData
-  this.setState({
-    gas: txData.txParams.gas,
-    gasPrice: txData.gasPrice,
-  })
-}
-
-// After a customizable state value has been updated,
-PTXP.gatherParams = function () {
-  log.debug(`pending-tx-details#gatherParams`)
-  const props = this.props
-  const state = this.state || {}
-  const txData = state.txData || props.txData
-  const txParams = txData.txParams
-  const gas = state.gas || txParams.gas
-  const gasPrice = state.gasPrice || txParams.gasPrice
-  const resultTx = extend(txParams, {
-    gas,
-    gasPrice,
-  })
-  const resultTxMeta = extend(txData, {
-    txParams: resultTx,
-  })
-  log.debug(`UI has computed tx params ${JSON.stringify(resultTx)}`)
-  return resultTxMeta
-}
-
-PTXP.verifyGasParams = function () {
-  // We call this in case the gas has not been modified at all
-  if (!this.state) { return true }
-  return this._notZeroOrEmptyString(this.state.gas) && this._notZeroOrEmptyString(this.state.gasPrice)
-}
-
-PTXP._notZeroOrEmptyString = function (obj) {
-  return obj !== '' && obj !== '0x0'
-}
-
-function forwardCarrat () {
-  return (
-
-    h('img', {
-      src: 'images/forward-carrat.svg',
-      style: {
-        padding: '5px 6px 0px 10px',
-        height: '37px',
-      },
-    })
-
-  )
-}
diff --git a/ui/app/components/pending-tx.js b/ui/app/components/pending-tx.js
index 2ab6f25a9..5bb088af9 100644
--- a/ui/app/components/pending-tx.js
+++ b/ui/app/components/pending-tx.js
@@ -2,27 +2,64 @@ const Component = require('react').Component
 const connect = require('react-redux').connect
 const h = require('react-hyperscript')
 const inherits = require('util').inherits
-const PendingTxDetails = require('./pending-tx-details')
 const extend = require('xtend')
 const actions = require('../actions')
 
+const ethUtil = require('ethereumjs-util')
+const BN = ethUtil.BN
+
+const MiniAccountPanel = require('./mini-account-panel')
+const EthBalance = require('./eth-balance')
+const util = require('../util')
+const addressSummary = util.addressSummary
+const nameForAddress = require('../../lib/contract-namer')
+const HexInput = require('./hex-as-decimal-input')
+
+const MIN_GAS_PRICE_BN = new BN(20000000)
+const MIN_GAS_LIMIT_BN = new BN(21000)
+
 module.exports = connect(mapStateToProps)(PendingTx)
 
 function mapStateToProps (state) {
-  return {
-
-  }
+  return {}
 }
 
 inherits(PendingTx, Component)
 function PendingTx () {
   Component.call(this)
+  this.state = {
+    valid: true,
+    gas: null,
+    gasPrice: null,
+    txData: null,
+  }
 }
 
 PendingTx.prototype.render = function () {
   const props = this.props
-  const newProps = extend(props, {ref: 'details'})
-  const txData = props.txData
+  const state = this.state
+
+  const txData = state.txData || props.txData
+  const txParams = txData.txParams || {}
+
+  const address = txParams.from || props.selectedAddress
+  const identity = props.identities[address] || { address: address }
+  const account = props.accounts[address]
+  const balance = account ? account.balance : '0x0'
+
+  const gas = state.gas || txParams.gas
+  const gasPrice = state.gasPrice || txData.gasPrice
+  const gasBn = new BN(gas, 16)
+  const gasPriceBn = new BN(gasPrice, 16)
+
+  const txFeeBn = gasBn.mul(gasPriceBn)
+  const valueBn = new BN(ethUtil.stripHexPrefix(txParams.value), 16)
+  const maxCost = txFeeBn.add(valueBn)
+
+  const dataLength = txParams.data ? (txParams.data.length - 2) / 2 : 0
+  const imageify = props.imageifyIdenticons === undefined ? true : props.imageifyIdenticons
+
+  this.inputs = []
 
   return (
 
@@ -30,70 +67,409 @@ PendingTx.prototype.render = function () {
       key: txData.id,
     }, [
 
-      // tx info
-      h(PendingTxDetails, newProps),
+      h('form#pending-tx-form', {
+        onSubmit: (event) => {
+          event.preventDefault()
+          const form = document.querySelector('form#pending-tx-form')
+          const valid = form.checkValidity()
+          this.setState({ valid })
 
-      h('style', `
-        .conf-buttons button {
-          margin-left: 10px;
-          text-transform: uppercase;
-        }
-      `),
+          if (valid && this.verifyGasParams()) {
+            props.sendTransaction(txData, event)
+          } else {
+            this.props.dispatch(actions.displayWarning('Invalid Gas Parameters'))
+          }
+        },
+      }, [
 
-      txData.simulationFails ?
-        h('.error', {
-          style: {
-            marginLeft: 50,
-            fontSize: '0.9em',
-          },
-        }, 'Transaction Error. Exception thrown in contract code.')
-      : null,
+        // tx info
+        h('div', [
 
-      props.insufficientBalance ?
-        h('span.error', {
-          style: {
-            marginLeft: 50,
-            fontSize: '0.9em',
-          },
-        }, 'Insufficient balance for transaction')
-      : null,
+          h('.flex-row.flex-center', {
+            style: {
+              maxWidth: '100%',
+            },
+          }, [
 
-      // send + cancel
-      h('.flex-row.flex-space-around.conf-buttons', {
-        style: {
-          display: 'flex',
-          justifyContent: 'flex-end',
-          margin: '14px 25px',
-        },
-      }, [
+            h(MiniAccountPanel, {
+              imageSeed: address,
+              imageifyIdenticons: imageify,
+              picOrder: 'right',
+            }, [
+              h('span.font-small', {
+                style: {
+                  fontFamily: 'Montserrat Bold, Montserrat, sans-serif',
+                },
+              }, identity.name),
+              h('span.font-small', {
+                style: {
+                  fontFamily: 'Montserrat Light, Montserrat, sans-serif',
+                },
+              }, addressSummary(address, 6, 4, false)),
+
+              h('span.font-small', {
+                style: {
+                  fontFamily: 'Montserrat Light, Montserrat, sans-serif',
+                },
+              }, [
+                h(EthBalance, {
+                  value: balance,
+                  inline: true,
+                  labelColor: '#F7861C',
+                }),
+              ]),
+            ]),
+
+            forwardCarrat(),
+
+            this.miniAccountPanelForRecipient(),
+          ]),
+
+          h('style', `
+            .table-box {
+              margin: 7px 0px 0px 0px;
+              width: 100%;
+            }
+            .table-box .row {
+              margin: 0px;
+              background: rgb(236,236,236);
+              display: flex;
+              justify-content: space-between;
+              font-family: Montserrat Light, sans-serif;
+              font-size: 13px;
+              padding: 5px 25px;
+            }
+            .table-box .row .value {
+              font-family: Montserrat Regular;
+            }
+          `),
+
+          h('.table-box', [
+
+            // Ether Value
+            // Currently not customizable, but easily modified
+            // in the way that gas and gasLimit currently are.
+            h('.row', [
+              h('.cell.label', 'Amount'),
+              h(EthBalance, { value: txParams.value }),
+            ]),
+
+            // Gas Limit (customizable)
+            h('.cell.row', [
+              h('.cell.label', 'Gas Limit'),
+              h('.cell.value', {
+              }, [
+                h(HexInput, {
+                  name: 'Gas Limit',
+                  value: gas,
+                  min: MIN_GAS_LIMIT_BN.toString(10), // The hard lower limit for gas.
+                  suffix: 'UNITS',
+                  style: {
+                    position: 'relative',
+                    top: '5px',
+                  },
+                  onChange: (newHex) => {
+                    log.info(`Gas limit changed to ${newHex}`)
+                    this.setState({ gas: newHex })
+                  },
+                  ref: (hexInput) => { this.inputs.push(hexInput) },
+                }),
+              ]),
+            ]),
+
+            // Gas Price (customizable)
+            h('.cell.row', [
+              h('.cell.label', 'Gas Price'),
+              h('.cell.value', {
+              }, [
+                h(HexInput, {
+                  name: 'Gas Price',
+                  value: gasPrice,
+                  suffix: 'WEI',
+                  min: MIN_GAS_PRICE_BN.toString(10),
+                  style: {
+                    position: 'relative',
+                    top: '5px',
+                  },
+                  onChange: (newHex) => {
+                    log.info(`Gas price changed to: ${newHex}`)
+                    this.setState({ gasPrice: newHex })
+                  },
+                  ref: (hexInput) => { this.inputs.push(hexInput) },
+                }),
+              ]),
+            ]),
+
+            // Max Transaction Fee (calculated)
+            h('.cell.row', [
+              h('.cell.label', 'Max Transaction Fee'),
+              h(EthBalance, { value: txFeeBn.toString(16) }),
+            ]),
+
+            h('.cell.row', {
+              style: {
+                fontFamily: 'Montserrat Regular',
+                background: 'white',
+                padding: '10px 25px',
+              },
+            }, [
+              h('.cell.label', 'Max Total'),
+              h('.cell.value', {
+                style: {
+                  display: 'flex',
+                  alignItems: 'center',
+                },
+              }, [
+                h(EthBalance, {
+                  value: maxCost.toString(16),
+                  inline: true,
+                  labelColor: 'black',
+                  fontSize: '16px',
+                }),
+              ]),
+            ]),
+
+            // Data size row:
+            h('.cell.row', {
+              style: {
+                background: '#f7f7f7',
+                paddingBottom: '0px',
+              },
+            }, [
+              h('.cell.label'),
+              h('.cell.value', {
+                style: {
+                  fontFamily: 'Montserrat Light',
+                  fontSize: '11px',
+                },
+              }, `Data included: ${dataLength} bytes`),
+            ]),
+          ]), // End of Table
+
+        ]),
+
+        h('style', `
+          .conf-buttons button {
+            margin-left: 10px;
+            text-transform: uppercase;
+          }
+        `),
+
+        txData.simulationFails ?
+          h('.error', {
+            style: {
+              marginLeft: 50,
+              fontSize: '0.9em',
+            },
+          }, 'Transaction Error. Exception thrown in contract code.')
+        : null,
 
         props.insufficientBalance ?
-          h('button', {
-            onClick: props.buyEth,
-          }, 'Buy Ether')
+          h('span.error', {
+            style: {
+              marginLeft: 50,
+              fontSize: '0.9em',
+            },
+          }, 'Insufficient balance for transaction')
         : null,
 
-        h('button', {
-          onClick: () => {
-            this.refs.details.resetGasFields()
-          },
-        }, 'Reset'),
-
-        h('button.confirm.btn-green', {
-          disabled: props.insufficientBalance,
-          onClick: (txData, event) => {
-            if (this.refs.details.verifyGasParams()) {
-              props.sendTransaction(txData, event)
-            } else {
-              this.props.dispatch(actions.displayWarning('Invalid Gas Parameters'))
-            }
+        // send + cancel
+        h('.flex-row.flex-space-around.conf-buttons', {
+          style: {
+            display: 'flex',
+            justifyContent: 'flex-end',
+            margin: '14px 25px',
           },
-        }, 'Accept'),
+        }, [
 
-        h('button.cancel.btn-red', {
-          onClick: props.cancelTransaction,
-        }, 'Reject'),
+
+          props.insufficientBalance ?
+            h('button', {
+              onClick: props.buyEth,
+            }, 'Buy Ether')
+          : null,
+
+          h('button', {
+            onClick: (event) => {
+              this.resetGasFields()
+              event.preventDefault()
+            },
+          }, 'Reset'),
+
+          // Accept Button
+          h('input.confirm.btn-green', {
+            type: 'submit',
+            value: 'ACCEPT',
+            style: { marginLeft: '10px' },
+            disabled: props.insufficientBalance || !this.state.valid,
+          }),
+
+          h('button.cancel.btn-red', {
+            onClick: props.cancelTransaction,
+          }, 'Reject'),
+        ]),
       ]),
     ])
   )
 }
+
+PendingTx.prototype.validChanged = function (newValid) {
+  this.setState({ valid: newValid })
+}
+
+PendingTx.prototype.miniAccountPanelForRecipient = function () {
+  const props = this.props
+  const txData = props.txData
+  const txParams = txData.txParams || {}
+  const isContractDeploy = !('to' in txParams)
+  const imageify = props.imageifyIdenticons === undefined ? true : props.imageifyIdenticons
+
+  // If it's not a contract deploy, send to the account
+  if (!isContractDeploy) {
+    return h(MiniAccountPanel, {
+      imageSeed: txParams.to,
+      imageifyIdenticons: imageify,
+      picOrder: 'left',
+    }, [
+      h('span.font-small', {
+        style: {
+          fontFamily: 'Montserrat Bold, Montserrat, sans-serif',
+        },
+      }, nameForAddress(txParams.to, props.identities)),
+      h('span.font-small', {
+        style: {
+          fontFamily: 'Montserrat Light, Montserrat, sans-serif',
+        },
+      }, addressSummary(txParams.to, 6, 4, false)),
+    ])
+  } else {
+    return h(MiniAccountPanel, {
+      imageifyIdenticons: imageify,
+      picOrder: 'left',
+    }, [
+
+      h('span.font-small', {
+        style: {
+          fontFamily: 'Montserrat Bold, Montserrat, sans-serif',
+        },
+      }, 'New Contract'),
+
+    ])
+  }
+}
+
+PendingTx.prototype.componentDidUpdate = function (prevProps, previousState) {
+  log.debug(`pending-tx componentDidUpdate`)
+  const state = this.state || {}
+  const prevState = previousState || {}
+  const { gas, gasPrice } = state
+
+  // Only if gas or gasPrice changed:
+  if (!prevState ||
+      (gas !== prevState.gas ||
+      gasPrice !== prevState.gasPrice)) {
+    log.debug(`recalculating gas since prev state change: ${JSON.stringify({ prevState, state })}`)
+    this.calculateGas()
+  }
+}
+
+PendingTx.prototype.calculateGas = function () {
+  const state = this.state
+  const props = this.props
+  const txData = props.txData
+
+  const txMeta = this.gatherParams()
+  log.debug(`pending-tx calculating gas for ${JSON.stringify(txMeta)}`)
+
+  const txParams = txMeta.txParams
+  const gasLimit = new BN(ethUtil.stripHexPrefix(txParams.gas || txMeta.estimatedGas), 16)
+  const gasPriceHex = state.gasPrice || txData.gasPrice
+  const gasPrice = new BN(ethUtil.stripHexPrefix(gasPriceHex), 16)
+
+  const valid = !gasPrice.lt(MIN_GAS_PRICE_BN) && !gasLimit.lt(MIN_GAS_LIMIT_BN)
+  this.validChanged(valid)
+
+  const txFee = gasLimit.mul(gasPrice)
+  const txValue = new BN(ethUtil.stripHexPrefix(txParams.value || '0x0'), 16)
+  const maxCost = txValue.add(txFee)
+
+  const txFeeHex = '0x' + txFee.toString('hex')
+  const maxCostHex = '0x' + maxCost.toString('hex')
+
+  txMeta.txFee = txFeeHex
+  txMeta.maxCost = maxCostHex
+  txMeta.txParams.gasPrice = gasPriceHex
+
+  const newState = {
+    txFee: '0x' + txFee.toString('hex'),
+    maxCost: '0x' + maxCost.toString('hex'),
+  }
+  log.info(`tx form updating local state with ${JSON.stringify(newState)}`)
+  this.setState(newState)
+
+  if (this.props.onTxChange) {
+    this.props.onTxChange(txMeta)
+  }
+}
+
+PendingTx.prototype.resetGasFields = function () {
+  log.debug(`pending-tx resetGasFields`)
+  const txData = this.props.txData
+
+  this.inputs.forEach((hexInput) => {
+    if (hexInput) {
+      hexInput.setValid()
+    }
+  })
+
+  this.setState({
+    gas: txData.txParams.gas,
+    gasPrice: txData.gasPrice,
+    valid: true,
+  })
+}
+
+// After a customizable state value has been updated,
+PendingTx.prototype.gatherParams = function () {
+  log.debug(`pending-tx gatherParams`)
+  const props = this.props
+  const state = this.state || {}
+  const txData = state.txData || props.txData
+  const txParams = txData.txParams
+  const gas = state.gas || txParams.gas
+  const gasPrice = state.gasPrice || txParams.gasPrice
+  const resultTx = extend(txParams, {
+    gas,
+    gasPrice,
+  })
+  const resultTxMeta = extend(txData, {
+    txParams: resultTx,
+  })
+  log.debug(`UI has computed tx params ${JSON.stringify(resultTx)}`)
+  return resultTxMeta
+}
+
+PendingTx.prototype.verifyGasParams = function () {
+  // We call this in case the gas has not been modified at all
+  if (!this.state) { return true }
+  return this._notZeroOrEmptyString(this.state.gas) && this._notZeroOrEmptyString(this.state.gasPrice)
+}
+
+PendingTx.prototype._notZeroOrEmptyString = function (obj) {
+  return obj !== '' && obj !== '0x0'
+}
+
+function forwardCarrat () {
+  return (
+
+    h('img', {
+      src: 'images/forward-carrat.svg',
+      style: {
+        padding: '5px 6px 0px 10px',
+        height: '37px',
+      },
+    })
+
+  )
+}
+
diff --git a/ui/app/components/transaction-list-item.js b/ui/app/components/transaction-list-item.js
index 44d2dc587..ee32be7d3 100644
--- a/ui/app/components/transaction-list-item.js
+++ b/ui/app/components/transaction-list-item.js
@@ -28,7 +28,7 @@ TransactionListItem.prototype.render = function () {
 
   let isLinkable = false
   const numericNet = parseInt(network)
-  isLinkable = numericNet === 1 || numericNet === 3
+  isLinkable = numericNet === 1 || numericNet === 3 || numericNet === 42
 
   var isMsg = ('msgParams' in transaction)
   var isTx = ('txParams' in transaction)
diff --git a/ui/app/conf-tx.js b/ui/app/conf-tx.js
index 07985094c..54c171a8a 100644
--- a/ui/app/conf-tx.js
+++ b/ui/app/conf-tx.js
@@ -43,8 +43,8 @@ ConfirmTxScreen.prototype.render = function () {
     unapprovedMsgs, unapprovedPersonalMsgs } = props
 
   var unconfTxList = txHelper(unapprovedTxs, unapprovedMsgs, unapprovedPersonalMsgs, network)
-  var index = props.index !== undefined && unconfTxList[index] ? props.index : 0
-  var txData = unconfTxList[index] || {}
+
+  var txData = unconfTxList[props.index] || {}
   var txParams = txData.params || {}
   var isNotification = isPopupOrNotification() === 'notification'
 
@@ -158,7 +158,7 @@ ConfirmTxScreen.prototype.checkBalanceAgainstTx = function (txData) {
 }
 
 ConfirmTxScreen.prototype.buyEth = function (address, event) {
-  event.stopPropagation()
+  this.stopPropagation(event)
   this.props.dispatch(actions.buyEthView(address))
 }
 
@@ -172,14 +172,15 @@ ConfirmTxScreen.prototype.onTxChange = function (txData) {
 // Must default to any local state txData,
 // to allow manual override of gas calculations.
 ConfirmTxScreen.prototype.sendTransaction = function (txData, event) {
-  event.stopPropagation()
+  this.stopPropagation(event)
   const state = this.state || {}
   const txMeta = state.txData
   this.props.dispatch(actions.updateAndApproveTx(txMeta || txData))
 }
 
 ConfirmTxScreen.prototype.cancelTransaction = function (txData, event) {
-  event.stopPropagation()
+  this.stopPropagation(event)
+  event.preventDefault()
   this.props.dispatch(actions.cancelTx(txData))
 }
 
@@ -187,32 +188,38 @@ ConfirmTxScreen.prototype.signMessage = function (msgData, event) {
   log.info('conf-tx.js: signing message')
   var params = msgData.msgParams
   params.metamaskId = msgData.id
-  event.stopPropagation()
+  this.stopPropagation(event)
   this.props.dispatch(actions.signMsg(params))
 }
 
+ConfirmTxScreen.prototype.stopPropagation = function (event) {
+  if (event.stopPropagation) {
+    event.stopPropagation()
+  }
+}
+
 ConfirmTxScreen.prototype.signPersonalMessage = function (msgData, event) {
   log.info('conf-tx.js: signing personal message')
   var params = msgData.msgParams
   params.metamaskId = msgData.id
-  event.stopPropagation()
+  this.stopPropagation(event)
   this.props.dispatch(actions.signPersonalMsg(params))
 }
 
 ConfirmTxScreen.prototype.cancelMessage = function (msgData, event) {
   log.info('canceling message')
-  event.stopPropagation()
+  this.stopPropagation(event)
   this.props.dispatch(actions.cancelMsg(msgData))
 }
 
 ConfirmTxScreen.prototype.cancelPersonalMessage = function (msgData, event) {
   log.info('canceling personal message')
-  event.stopPropagation()
+  this.stopPropagation(event)
   this.props.dispatch(actions.cancelPersonalMsg(msgData))
 }
 
 ConfirmTxScreen.prototype.goHome = function (event) {
-  event.stopPropagation()
+  this.stopPropagation(event)
   this.props.dispatch(actions.goHome())
 }
 
diff --git a/ui/app/css/index.css b/ui/app/css/index.css
index 3ec0ac5c5..de8ae0e92 100644
--- a/ui/app/css/index.css
+++ b/ui/app/css/index.css
@@ -32,7 +32,7 @@ input:focus, textarea:focus {
   height: 500px;
 }
 
-button {
+button, input[type="submit"] {
   font-family: 'Montserrat Bold';
   outline: none;
   cursor: pointer;
@@ -46,17 +46,17 @@ button {
   box-shadow: 0px 3px 6px rgba(247, 134, 28, 0.36);
 }
 
-button.btn-green {
+.btn-green, input[type="submit"].btn-green {
   background: rgba(106, 195, 96, 1);
   box-shadow: 0px 3px 6px rgba(106, 195, 96, 0.36);
 }
 
-button.btn-red {
+.btn-red {
   background: rgba(254, 35, 17, 1);
   box-shadow: 0px 3px 6px rgba(254, 35, 17, 0.36);
 }
 
-button[disabled] {
+button[disabled], input[type="submit"][disabled] {
   cursor: not-allowed;
   background: rgba(197, 197, 197, 1);
   box-shadow: 0px 3px 6px rgba(197, 197, 197, 0.36);
@@ -66,10 +66,10 @@ button.spaced {
   margin: 2px;
 }
 
-button:not([disabled]):hover {
+button:not([disabled]):hover, input[type="submit"]:not([disabled]):hover {
   transform: scale(1.1);
 }
-button:not([disabled]):active {
+button:not([disabled]):active, input[type="submit"]:not([disabled]):active {
   transform: scale(0.95);
 }
 
diff --git a/ui/app/reducers/app.js b/ui/app/reducers/app.js
index b9e3f7b16..3a6baca91 100644
--- a/ui/app/reducers/app.js
+++ b/ui/app/reducers/app.js
@@ -592,8 +592,9 @@ function hasPendingTxs (state) {
 function indexForPending (state, txId) {
   var unapprovedTxs = state.metamask.unapprovedTxs
   var unapprovedMsgs = state.metamask.unapprovedMsgs
+  var unapprovedPersonalMsgs = state.metamask.unapprovedPersonalMsgs
   var network = state.metamask.network
-  var unconfTxList = txHelper(unapprovedTxs, unapprovedMsgs, network)
+  var unconfTxList = txHelper(unapprovedTxs, unapprovedMsgs, unapprovedPersonalMsgs, network)
   let idx
   unconfTxList.forEach((tx, i) => {
     if (tx.id === txId) {