diff --git a/CHANGELOG.md b/CHANGELOG.md
index 88c299c7d..e3ab9d3b1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,12 @@
 
 ## Current Develop Branch
 
+## 9.0.1 Wed Jan 13 2021
+- [#10169](https://github.com/MetaMask/metamask-extension/pull/10169): Improved detection of contract methods with array parameters
+- [#10178](https://github.com/MetaMask/metamask-extension/pull/10178): Only warn of injected web3 usage once per page
+- [#10179](https://github.com/MetaMask/metamask-extension/pull/10179): Restore support for @metamask/inpage provider@"< 8.0.0"
+- [#10180](https://github.com/MetaMask/metamask-extension/pull/10180): Fix UI crash when domain metadata is missing on public encryption key confirmation page
+
 ## 9.0.0 Fri Jan 8 2021
 
 - [#9156](https://github.com/MetaMask/metamask-extension/pull/9156): Remove window.web3 injection
diff --git a/app/manifest/_base.json b/app/manifest/_base.json
index 5fef12ea1..6b6a4e2b0 100644
--- a/app/manifest/_base.json
+++ b/app/manifest/_base.json
@@ -78,6 +78,6 @@
     "notifications"
   ],
   "short_name": "__MSG_appName__",
-  "version": "9.0.0",
+  "version": "9.0.1",
   "web_accessible_resources": ["inpage.js", "phishing.html"]
 }
diff --git a/app/scripts/contentscript.js b/app/scripts/contentscript.js
index 7e55faec4..116cad02d 100644
--- a/app/scripts/contentscript.js
+++ b/app/scripts/contentscript.js
@@ -4,6 +4,7 @@ import LocalMessageDuplexStream from 'post-message-stream'
 import ObjectMultiplex from 'obj-multiplex'
 import extension from 'extensionizer'
 import PortStream from 'extension-port-stream'
+import { obj as createThoughStream } from 'through2'
 
 // These require calls need to use require to be statically recognized by browserify
 const fs = require('fs')
@@ -20,6 +21,12 @@ const CONTENT_SCRIPT = 'metamask-contentscript'
 const INPAGE = 'metamask-inpage'
 const PROVIDER = 'metamask-provider'
 
+// TODO:LegacyProvider: Delete
+const LEGACY_CONTENT_SCRIPT = 'contentscript'
+const LEGACY_INPAGE = 'inpage'
+const LEGACY_PROVIDER = 'provider'
+const LEGACY_PUBLIC_CONFIG = 'publicConfig'
+
 if (shouldInjectProvider()) {
   injectScript(inpageBundle)
   setupStreams()
@@ -63,6 +70,7 @@ async function setupStreams() {
   pageMux.setMaxListeners(25)
   const extensionMux = new ObjectMultiplex()
   extensionMux.setMaxListeners(25)
+  extensionMux.ignoreStream(LEGACY_PUBLIC_CONFIG) // TODO:LegacyProvider: Delete
 
   pump(pageMux, pageStream, pageMux, (err) =>
     logStreamDisconnectWarning('MetaMask Inpage Multiplex', err),
@@ -78,6 +86,44 @@ async function setupStreams() {
   // connect "phishing" channel to warning system
   const phishingStream = extensionMux.createStream('phishing')
   phishingStream.once('data', redirectToPhishingWarning)
+
+  // TODO:LegacyProvider: Delete
+  // handle legacy provider
+  const legacyPageStream = new LocalMessageDuplexStream({
+    name: LEGACY_CONTENT_SCRIPT,
+    target: LEGACY_INPAGE,
+  })
+
+  const legacyPageMux = new ObjectMultiplex()
+  legacyPageMux.setMaxListeners(25)
+  const legacyExtensionMux = new ObjectMultiplex()
+  legacyExtensionMux.setMaxListeners(25)
+
+  pump(legacyPageMux, legacyPageStream, legacyPageMux, (err) =>
+    logStreamDisconnectWarning('MetaMask Legacy Inpage Multiplex', err),
+  )
+  pump(
+    legacyExtensionMux,
+    extensionStream,
+    getNotificationTransformStream(),
+    legacyExtensionMux,
+    (err) => {
+      logStreamDisconnectWarning('MetaMask Background Legacy Multiplex', err)
+      notifyInpageOfStreamFailure()
+    },
+  )
+
+  forwardNamedTrafficBetweenMuxes(
+    LEGACY_PROVIDER,
+    PROVIDER,
+    legacyPageMux,
+    legacyExtensionMux,
+  )
+  forwardTrafficBetweenMuxes(
+    LEGACY_PUBLIC_CONFIG,
+    legacyPageMux,
+    legacyExtensionMux,
+  )
 }
 
 function forwardTrafficBetweenMuxes(channelName, muxA, muxB) {
@@ -91,6 +137,37 @@ function forwardTrafficBetweenMuxes(channelName, muxA, muxB) {
   )
 }
 
+// TODO:LegacyProvider: Delete
+function forwardNamedTrafficBetweenMuxes(
+  channelAName,
+  channelBName,
+  muxA,
+  muxB,
+) {
+  const channelA = muxA.createStream(channelAName)
+  const channelB = muxB.createStream(channelBName)
+  pump(channelA, channelB, channelA, (error) =>
+    console.debug(
+      `MetaMask: Muxed traffic between channels "${channelAName}" and "${channelBName}" failed.`,
+      error,
+    ),
+  )
+}
+
+// TODO:LegacyProvider: Delete
+function getNotificationTransformStream() {
+  return createThoughStream((chunk, _, cb) => {
+    if (chunk?.name === PROVIDER) {
+      if (chunk.data?.method === 'metamask_accountsChanged') {
+        chunk.data.method = 'wallet_accountsChanged'
+        chunk.data.result = chunk.data.params
+        delete chunk.data.params
+      }
+    }
+    cb(null, chunk)
+  })
+}
+
 /**
  * Error handler for page to extension stream disconnections
  *
diff --git a/app/scripts/metamask-controller.js b/app/scripts/metamask-controller.js
index 0608ac2b8..2e76464aa 100644
--- a/app/scripts/metamask-controller.js
+++ b/app/scripts/metamask-controller.js
@@ -1,6 +1,8 @@
 import EventEmitter from 'events'
 import pump from 'pump'
 import Dnode from 'dnode'
+import { ObservableStore } from '@metamask/obs-store'
+import { storeAsStream } from '@metamask/obs-store/dist/asStream'
 import { JsonRpcEngine } from 'json-rpc-engine'
 import { debounce } from 'lodash'
 import createEngineStream from 'json-rpc-middleware-stream/engineStream'
@@ -413,6 +415,9 @@ export default class MetamaskController extends EventEmitter {
     ) {
       this.submitPassword(password)
     }
+
+    // TODO:LegacyProvider: Delete
+    this.publicConfigStore = this.createPublicConfigStore()
   }
 
   /**
@@ -459,6 +464,38 @@ export default class MetamaskController extends EventEmitter {
     return providerProxy
   }
 
+  /**
+   * TODO:LegacyProvider: Delete
+   * Constructor helper: initialize a public config store.
+   * This store is used to make some config info available to Dapps synchronously.
+   */
+  createPublicConfigStore() {
+    // subset of state for metamask inpage provider
+    const publicConfigStore = new ObservableStore()
+    const { networkController } = this
+
+    // setup memStore subscription hooks
+    this.on('update', updatePublicConfigStore)
+    updatePublicConfigStore(this.getState())
+
+    function updatePublicConfigStore(memState) {
+      const chainId = networkController.getCurrentChainId()
+      if (memState.network !== 'loading') {
+        publicConfigStore.putState(selectPublicState(chainId, memState))
+      }
+    }
+
+    function selectPublicState(chainId, { isUnlocked, network }) {
+      return {
+        isUnlocked,
+        chainId,
+        networkVersion: network,
+      }
+    }
+
+    return publicConfigStore
+  }
+
   /**
    * Gets relevant state for the provider of an external origin.
    *
@@ -1831,6 +1868,10 @@ export default class MetamaskController extends EventEmitter {
 
     // messages between inpage and background
     this.setupProviderConnection(mux.createStream('metamask-provider'), sender)
+
+    // TODO:LegacyProvider: Delete
+    // legacy streams
+    this.setupPublicConfig(mux.createStream('publicConfig'))
   }
 
   /**
@@ -2016,6 +2057,28 @@ export default class MetamaskController extends EventEmitter {
     return engine
   }
 
+  /**
+   * TODO:LegacyProvider: Delete
+   * A method for providing our public config info over a stream.
+   * This includes info we like to be synchronous if possible, like
+   * the current selected account, and network ID.
+   *
+   * Since synchronous methods have been deprecated in web3,
+   * this is a good candidate for deprecation.
+   *
+   * @param {*} outStream - The stream to provide public config over.
+   */
+  setupPublicConfig(outStream) {
+    const configStream = storeAsStream(this.publicConfigStore)
+
+    pump(configStream, outStream, (err) => {
+      configStream.destroy()
+      if (err) {
+        log.error(err)
+      }
+    })
+  }
+
   /**
    * Adds a reference to a connection by origin. Ignores the 'metamask' origin.
    * Caller must ensure that the returned id is stored such that the reference
diff --git a/package.json b/package.json
index 312789a00..ba59f09d3 100644
--- a/package.json
+++ b/package.json
@@ -81,7 +81,7 @@
     "@metamask/eth-ledger-bridge-keyring": "^0.2.6",
     "@metamask/eth-token-tracker": "^3.0.1",
     "@metamask/etherscan-link": "^1.4.0",
-    "@metamask/inpage-provider": "^8.0.1",
+    "@metamask/inpage-provider": "^8.0.2",
     "@metamask/jazzicon": "^2.0.0",
     "@metamask/logo": "^2.5.0",
     "@metamask/obs-store": "^5.0.0",
@@ -110,7 +110,7 @@
     "eth-json-rpc-infura": "^5.1.0",
     "eth-json-rpc-middleware": "^6.0.0",
     "eth-keyring-controller": "^6.1.0",
-    "eth-method-registry": "^1.2.0",
+    "eth-method-registry": "^2.0.0",
     "eth-phishing-detect": "^1.1.14",
     "eth-query": "^2.1.2",
     "eth-sig-util": "^3.0.0",
diff --git a/ui/app/helpers/utils/transactions.util.js b/ui/app/helpers/utils/transactions.util.js
index 6dda958cc..bcafae970 100644
--- a/ui/app/helpers/utils/transactions.util.js
+++ b/ui/app/helpers/utils/transactions.util.js
@@ -1,4 +1,4 @@
-import MethodRegistry from 'eth-method-registry'
+import { MethodRegistry } from 'eth-method-registry'
 import abi from 'human-standard-token-abi'
 import { ethers } from 'ethers'
 import log from 'loglevel'
diff --git a/ui/app/pages/confirm-encryption-public-key/confirm-encryption-public-key.component.js b/ui/app/pages/confirm-encryption-public-key/confirm-encryption-public-key.component.js
index 08a3cbf95..c3d1dfaa2 100644
--- a/ui/app/pages/confirm-encryption-public-key/confirm-encryption-public-key.component.js
+++ b/ui/app/pages/confirm-encryption-public-key/confirm-encryption-public-key.component.js
@@ -158,23 +158,24 @@ export default class ConfirmEncryptionPublicKey extends Component {
     const { domainMetadata, txData } = this.props
     const { t } = this.context
 
-    const origin = domainMetadata[txData.origin]
-    const notice = t('encryptionPublicKeyNotice', [origin.name])
+    const originMetadata = domainMetadata[txData.origin]
+    const notice = t('encryptionPublicKeyNotice', [txData.origin])
+    const name = originMetadata?.name || txData.origin
 
     return (
       <div className="request-encryption-public-key__body">
         {this.renderAccountInfo()}
         <div className="request-encryption-public-key__visual">
           <section>
-            {origin.icon ? (
+            {originMetadata?.icon ? (
               <img
                 className="request-encryption-public-key__visual-identicon"
-                src={origin.icon}
+                src={originMetadata.icon}
                 alt=""
               />
             ) : (
               <i className="request-encryption-public-key__visual-identicon--default">
-                {origin.name.charAt(0).toUpperCase()}
+                {name.charAt(0).toUpperCase()}
               </i>
             )}
             <div className="request-encryption-public-key__notice">
diff --git a/yarn.lock b/yarn.lock
index 56428f975..126c52d11 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2114,18 +2114,18 @@
   resolved "https://registry.yarnpkg.com/@metamask/forwarder/-/forwarder-1.1.0.tgz#13829d8244bbf19ea658c0b20d21a77b67de0bdd"
   integrity sha512-Hggj4y0QIjDzKGTXzarhEPIQyFSB2bi2y6YLJNwaT4JmP30UB5Cj6gqoY0M4pj3QT57fzp0BUuGp7F/AUe28tw==
 
-"@metamask/inpage-provider@^8.0.1":
-  version "8.0.1"
-  resolved "https://registry.yarnpkg.com/@metamask/inpage-provider/-/inpage-provider-8.0.1.tgz#67b1f0733ae7c0e0e429dc5c067ba9d2dd6d66da"
-  integrity sha512-dN3IpiJtaHeiPzF01UXnrQ6TxXbXbkU54kiOHuIUe9e8s7vyPzgDgN2nj84xjmIkqxL0MKY90Wcp0obFKnNj+Q==
+"@metamask/inpage-provider@^8.0.2":
+  version "8.0.2"
+  resolved "https://registry.yarnpkg.com/@metamask/inpage-provider/-/inpage-provider-8.0.2.tgz#50e7559a3ab729e46c5f1e92baa3a3465617c10e"
+  integrity sha512-LG4wqf7LKwv9akI38HR25Mt/9+YD+DOtbZZKZSG8zUx3hI8moIKxbSwS64pqEyARmLhLKXYkZNROkPjxqbvTdA==
   dependencies:
+    "@metamask/object-multiplex" "^1.1.0"
     "@metamask/safe-event-emitter" "^2.0.0"
     eth-rpc-errors "^4.0.2"
     fast-deep-equal "^2.0.1"
     is-stream "^2.0.0"
     json-rpc-engine "^6.1.0"
-    json-rpc-middleware-stream "^2.1.1"
-    obj-multiplex "^1.0.0"
+    json-rpc-middleware-stream "^3.0.0"
     pump "^3.0.0"
 
 "@metamask/jazzicon@^2.0.0":
@@ -2144,6 +2144,15 @@
     gl-mat4 "1.1.4"
     gl-vec3 "1.0.3"
 
+"@metamask/object-multiplex@^1.1.0":
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/@metamask/object-multiplex/-/object-multiplex-1.1.0.tgz#6b1507c4d10caafd2ea82dd2a5360b91631e036e"
+  integrity sha512-ImDw5+NdO5qnzmK/rpSlPmQMQm6HIC6wAHdR9nBaDK8TpeuRik5H8DCUcoNrxSeUAk1iHwchZ03lpZu6mZfrdw==
+  dependencies:
+    end-of-stream "^1.4.4"
+    once "^1.4.0"
+    readable-stream "^2.3.3"
+
 "@metamask/obs-store@^5.0.0":
   version "5.0.0"
   resolved "https://registry.yarnpkg.com/@metamask/obs-store/-/obs-store-5.0.0.tgz#cf2213874c62186a8a4c80f0c402af62a0a877a9"
@@ -9858,12 +9867,12 @@ eth-method-registry@1.1.0:
   dependencies:
     ethjs "^0.3.0"
 
-eth-method-registry@^1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/eth-method-registry/-/eth-method-registry-1.2.0.tgz#2160592d7938ef0b850c9267bc40b3470c2700c9"
-  integrity sha512-m+nphH4kOxz5KTvQ+BeIKVggxAul1sp4Ev09lfxRXIEHM1t/6NQEtaErL5ddTDFXXFVtTiW8uC9edTVUTnBZNg==
+eth-method-registry@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/eth-method-registry/-/eth-method-registry-2.0.0.tgz#96b643891d1c72853e709e3d74d89103a48a4460"
+  integrity sha512-uzwguuAdnd83SjogNo0xMd7pSuyK1dlyAeVGB++OaY7xaprT+31jXkBGYSIkmTz7sGIVf6A1Qy9Ir+/hXs4jWg==
   dependencies:
-    ethjs "^0.3.0"
+    ethjs "^0.4.0"
 
 eth-phishing-detect@^1.1.13, eth-phishing-detect@^1.1.14:
   version "1.1.14"
@@ -15234,6 +15243,14 @@ json-rpc-middleware-stream@^2.1.1:
     readable-stream "^2.3.3"
     safe-event-emitter "^1.0.1"
 
+json-rpc-middleware-stream@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/json-rpc-middleware-stream/-/json-rpc-middleware-stream-3.0.0.tgz#8540331d884f36b9e0ad31054cc68ac6b5a89b52"
+  integrity sha512-JmZmlehE0xF3swwORpLHny/GvW3MZxCsb2uFNBrn8TOqMqivzCfz232NSDLLOtIQlrPlgyEjiYpyzyOPFOzClw==
+  dependencies:
+    "@metamask/safe-event-emitter" "^2.0.0"
+    readable-stream "^2.3.3"
+
 json-rpc-random-id@^1.0.0, json-rpc-random-id@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/json-rpc-random-id/-/json-rpc-random-id-1.0.1.tgz#ba49d96aded1444dbb8da3d203748acbbcdec8c8"