diff --git a/test/e2e/address-book.spec.js b/test/e2e/address-book.spec.js
index 3c5e78b50..3e95daaef 100644
--- a/test/e2e/address-book.spec.js
+++ b/test/e2e/address-book.spec.js
@@ -17,8 +17,8 @@ const {
   findElements,
   loadExtension,
   verboseReportOnFailure,
+  setupFetchMocking,
 } = require('./helpers')
-const fetchMockResponses = require('./fetch-mocks.js')
 
 describe('MetaMask', function () {
   let extensionId
@@ -63,31 +63,7 @@ describe('MetaMask', function () {
   })
 
   beforeEach(async function () {
-    await driver.executeScript(
-      'window.origFetch = window.fetch.bind(window);' +
-      'window.fetch = ' +
-      '(...args) => { ' +
-      'if (args[0] === "https://ethgasstation.info/json/ethgasAPI.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.ethGasBasic + '\')) }); } else if ' +
-      '(args[0] === "https://ethgasstation.info/json/predictTable.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.ethGasPredictTable + '\')) }); } else if ' +
-      '(args[0].match(/chromeextensionmm/)) { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.metametrics + '\')) }); } else if ' +
-      '(args[0] === "https://dev.blockscale.net/api/gasexpress.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.gasExpress + '\')) }); } ' +
-      'return window.origFetch(...args); };' +
-      'function cancelInfuraRequest(requestDetails) {' +
-        'console.log("Canceling: " + requestDetails.url);' +
-        'return {' +
-          'cancel: true' +
-        '};' +
-     ' }' +
-      'window.chrome && window.chrome.webRequest && window.chrome.webRequest.onBeforeRequest.addListener(' +
-        'cancelInfuraRequest,' +
-        '{urls: ["https://*.infura.io/*"]},' +
-        '["blocking"]' +
-      ');'
-    )
+    await setupFetchMocking(driver)
   })
 
   afterEach(async function () {
diff --git a/test/e2e/from-import-ui.spec.js b/test/e2e/from-import-ui.spec.js
index 896447c77..60bba25fa 100644
--- a/test/e2e/from-import-ui.spec.js
+++ b/test/e2e/from-import-ui.spec.js
@@ -16,9 +16,8 @@ const {
   verboseReportOnFailure,
   findElement,
   findElements,
+  setupFetchMocking,
 } = require('./helpers')
-const fetchMockResponses = require('./fetch-mocks.js')
-
 
 describe('Using MetaMask with an existing account', function () {
   let extensionId
@@ -66,31 +65,7 @@ describe('Using MetaMask with an existing account', function () {
   })
 
   beforeEach(async function () {
-    await driver.executeScript(
-      'window.origFetch = window.fetch.bind(window);' +
-      'window.fetch = ' +
-      '(...args) => { ' +
-      'if (args[0] === "https://ethgasstation.info/json/ethgasAPI.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.ethGasBasic + '\')) }); } else if ' +
-      '(args[0] === "https://ethgasstation.info/json/predictTable.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.ethGasPredictTable + '\')) }); } else if ' +
-      '(args[0].match(/chromeextensionmm/)) { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.metametrics + '\')) }); } else if ' +
-      '(args[0] === "https://dev.blockscale.net/api/gasexpress.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.gasExpress + '\')) }); } ' +
-      'return window.origFetch(...args); };' +
-      'function cancelInfuraRequest(requestDetails) {' +
-        'console.log("Canceling: " + requestDetails.url);' +
-        'return {' +
-          'cancel: true' +
-        '};' +
-     ' }' +
-      'window.chrome && window.chrome.webRequest && window.chrome.webRequest.onBeforeRequest.addListener(' +
-        'cancelInfuraRequest,' +
-        '{urls: ["https://*.infura.io/*"]},' +
-        '["blocking"]' +
-      ');'
-    )
+    await setupFetchMocking(driver)
   })
 
   afterEach(async function () {
diff --git a/test/e2e/helpers.js b/test/e2e/helpers.js
index 30b8d13f6..d74e45544 100644
--- a/test/e2e/helpers.js
+++ b/test/e2e/helpers.js
@@ -4,6 +4,8 @@ const pify = require('pify')
 const assert = require('assert')
 const { delay } = require('./func')
 const { until } = require('selenium-webdriver')
+const fetchMockResponses = require('./fetch-mocks.js')
+
 
 module.exports = {
   assertElementNotPresent,
@@ -17,6 +19,36 @@ module.exports = {
   switchToWindowWithUrlThatMatches,
   verboseReportOnFailure,
   waitUntilXWindowHandles,
+  setupFetchMocking,
+}
+
+async function setupFetchMocking (driver) {
+  // define fetchMocking script, to be evaluated in the browser 
+  function fetchMocking() {
+    window.origFetch = window.fetch.bind(window)
+    window.fetch = async (...args) => {
+      const url = args[0]
+      if (url === "https://ethgasstation.info/json/ethgasAPI.json") {
+        return { json: async () => JSON.parse( fetchMockResponses.ethGasBasic ) }
+      } else if (url === "https://ethgasstation.info/json/predictTable.json") {
+        return { json: async () => JSON.parse( fetchMockResponses.ethGasPredictTable ) }
+      } else if (url.match(/chromeextensionmm/)) {
+        return { json: async () => JSON.parse( fetchMockResponses.metametrics ) }
+      } else if (url === "https://dev.blockscale.net/api/gasexpress.json") {
+        return { json: async () => JSON.parse( fetchMockResponses.gasExpress ) }
+      }
+      return window.origFetch(...args)
+    }
+    function cancelInfuraRequest(requestDetails) {
+      console.log(`fetchMocking - Canceling request: "${requestDetails.url}"`)
+      return { cancel: true }
+    }
+    if (window.chrome && window.chrome.webRequest) {
+      window.chrome.webRequest.onBeforeRequest.addListener(cancelInfuraRequest, {urls: ['https://*.infura.io/*']}, ['blocking'])
+    }
+  }
+  // eval the fetchMocking script in the browser
+  await driver.executeScript(`(${fetchMocking})()`)
 }
 
 async function loadExtension (driver, extensionId) {
diff --git a/test/e2e/incremental-security.spec.js b/test/e2e/incremental-security.spec.js
index ecd6f5999..3a44badd6 100644
--- a/test/e2e/incremental-security.spec.js
+++ b/test/e2e/incremental-security.spec.js
@@ -19,8 +19,8 @@ const {
   loadExtension,
   openNewPage,
   verboseReportOnFailure,
+  setupFetchMocking,
 } = require('./helpers')
-const fetchMockResponses = require('./fetch-mocks.js')
 
 describe('MetaMask', function () {
   let extensionId
@@ -65,31 +65,7 @@ describe('MetaMask', function () {
   })
 
   beforeEach(async function () {
-    await driver.executeScript(
-      'window.origFetch = window.fetch.bind(window);' +
-      'window.fetch = ' +
-      '(...args) => { ' +
-      'if (args[0] === "https://ethgasstation.info/json/ethgasAPI.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.ethGasBasic + '\')) }); } else if ' +
-      '(args[0] === "https://ethgasstation.info/json/predictTable.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.ethGasPredictTable + '\')) }); } else if ' +
-      '(args[0].match(/chromeextensionmm/)) { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.metametrics + '\')) }); } else if ' +
-      '(args[0] === "https://dev.blockscale.net/api/gasexpress.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.gasExpress + '\')) }); } ' +
-      'return window.origFetch(...args); };' +
-      'function cancelInfuraRequest(requestDetails) {' +
-        'console.log("Canceling: " + requestDetails.url);' +
-        'return {' +
-          'cancel: true' +
-        '};' +
-     ' }' +
-      'window.chrome && window.chrome.webRequest && window.chrome.webRequest.onBeforeRequest.addListener(' +
-        'cancelInfuraRequest,' +
-        '{urls: ["https://*.infura.io/*"]},' +
-        '["blocking"]' +
-      ');'
-    )
+    await setupFetchMocking(driver)
   })
 
   afterEach(async function () {
diff --git a/test/e2e/metamask-responsive-ui.spec.js b/test/e2e/metamask-responsive-ui.spec.js
index fa7425d61..a7535a47a 100644
--- a/test/e2e/metamask-responsive-ui.spec.js
+++ b/test/e2e/metamask-responsive-ui.spec.js
@@ -17,8 +17,8 @@ const {
   findElements,
   loadExtension,
   verboseReportOnFailure,
+  setupFetchMocking,
 } = require('./helpers')
-const fetchMockResponses = require('./fetch-mocks.js')
 
 describe('MetaMask', function () {
   let extensionId
@@ -63,31 +63,7 @@ describe('MetaMask', function () {
   })
 
   beforeEach(async function () {
-    await driver.executeScript(
-      'window.origFetch = window.fetch.bind(window);' +
-      'window.fetch = ' +
-      '(...args) => { ' +
-      'if (args[0] === "https://ethgasstation.info/json/ethgasAPI.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.ethGasBasic + '\')) }); } else if ' +
-      '(args[0] === "https://ethgasstation.info/json/predictTable.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.ethGasPredictTable + '\')) }); } else if ' +
-      '(args[0].match(/chromeextensionmm/)) { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.metametrics + '\')) }); } else if ' +
-      '(args[0] === "https://dev.blockscale.net/api/gasexpress.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.gasExpress + '\')) }); } ' +
-      'return window.origFetch(...args); };' +
-      'function cancelInfuraRequest(requestDetails) {' +
-        'console.log("Canceling: " + requestDetails.url);' +
-        'return {' +
-          'cancel: true' +
-        '};' +
-     ' }' +
-      'window.chrome && window.chrome.webRequest && window.chrome.webRequest.onBeforeRequest.addListener(' +
-        'cancelInfuraRequest,' +
-        '{urls: ["https://*.infura.io/*"]},' +
-        '["blocking"]' +
-      ');'
-    )
+    await setupFetchMocking(driver)
   })
 
   afterEach(async function () {
diff --git a/test/e2e/metamask-ui.spec.js b/test/e2e/metamask-ui.spec.js
index 90f320904..031d2bb14 100644
--- a/test/e2e/metamask-ui.spec.js
+++ b/test/e2e/metamask-ui.spec.js
@@ -21,8 +21,8 @@ const {
   switchToWindowWithTitle,
   verboseReportOnFailure,
   waitUntilXWindowHandles,
+  setupFetchMocking,
 } = require('./helpers')
-const fetchMockResponses = require('./fetch-mocks.js')
 
 describe('MetaMask', function () {
   let extensionId
@@ -68,31 +68,7 @@ describe('MetaMask', function () {
   })
 
   beforeEach(async function () {
-    await driver.executeScript(
-      'window.origFetch = window.fetch.bind(window);' +
-      'window.fetch = ' +
-      '(...args) => { ' +
-      'if (args[0] === "https://ethgasstation.info/json/ethgasAPI.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.ethGasBasic + '\')) }); } else if ' +
-      '(args[0] === "https://ethgasstation.info/json/predictTable.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.ethGasPredictTable + '\')) }); } else if ' +
-      '(args[0].match(/chromeextensionmm/)) { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.metametrics + '\')) }); } else if ' +
-      '(args[0] === "https://dev.blockscale.net/api/gasexpress.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.gasExpress + '\')) }); } ' +
-      'return window.origFetch(...args); };' +
-      'function cancelInfuraRequest(requestDetails) {' +
-        'console.log("Canceling: " + requestDetails.url);' +
-        'return {' +
-          'cancel: true' +
-        '};' +
-     ' }' +
-      'window.chrome && window.chrome.webRequest && window.chrome.webRequest.onBeforeRequest.addListener(' +
-        'cancelInfuraRequest,' +
-        '{urls: ["https://*.infura.io/*"]},' +
-        '["blocking"]' +
-      ');'
-    )
+    await setupFetchMocking(driver)
   })
 
   afterEach(async function () {
diff --git a/test/e2e/send-edit.spec.js b/test/e2e/send-edit.spec.js
index 4eca232ee..bc5160112 100644
--- a/test/e2e/send-edit.spec.js
+++ b/test/e2e/send-edit.spec.js
@@ -16,9 +16,8 @@ const {
   verboseReportOnFailure,
   findElement,
   findElements,
+  setupFetchMocking,
 } = require('./helpers')
-const fetchMockResponses = require('./fetch-mocks.js')
-
 
 describe('Using MetaMask with an existing account', function () {
   let extensionId
@@ -63,31 +62,7 @@ describe('Using MetaMask with an existing account', function () {
   })
 
   beforeEach(async function () {
-    await driver.executeScript(
-      'window.origFetch = window.fetch.bind(window);' +
-      'window.fetch = ' +
-      '(...args) => { ' +
-      'if (args[0] === "https://ethgasstation.info/json/ethgasAPI.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.ethGasBasic + '\')) }); } else if ' +
-      '(args[0] === "https://ethgasstation.info/json/predictTable.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.ethGasPredictTable + '\')) }); } else if ' +
-      '(args[0].match(/chromeextensionmm/)) { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.metametrics + '\')) }); } else if ' +
-      '(args[0] === "https://dev.blockscale.net/api/gasexpress.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.gasExpress + '\')) }); } ' +
-      'return window.origFetch(...args); };' +
-      'function cancelInfuraRequest(requestDetails) {' +
-        'console.log("Canceling: " + requestDetails.url);' +
-        'return {' +
-          'cancel: true' +
-        '};' +
-     ' }' +
-      'window.chrome && window.chrome.webRequest && window.chrome.webRequest.onBeforeRequest.addListener(' +
-        'cancelInfuraRequest,' +
-        '{urls: ["https://*.infura.io/*"]},' +
-        '["blocking"]' +
-      ');'
-    )
+    await setupFetchMocking(driver)
   })
 
   afterEach(async function () {
diff --git a/test/e2e/web3.spec.js b/test/e2e/web3.spec.js
index 42f235045..ae1c3091e 100644
--- a/test/e2e/web3.spec.js
+++ b/test/e2e/web3.spec.js
@@ -19,9 +19,8 @@ const {
   switchToWindowWithTitle,
   verboseReportOnFailure,
   waitUntilXWindowHandles,
+  setupFetchMocking,
 } = require('./helpers')
-const fetchMockResponses = require('./fetch-mocks.js')
-
 
 describe('Using MetaMask with an existing account', function () {
   let extensionId
@@ -77,31 +76,7 @@ describe('Using MetaMask with an existing account', function () {
   })
 
   beforeEach(async function () {
-    await driver.executeScript(
-      'window.origFetch = window.fetch.bind(window);' +
-      'window.fetch = ' +
-      '(...args) => { ' +
-      'if (args[0] === "https://ethgasstation.info/json/ethgasAPI.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.ethGasBasic + '\')) }); } else if ' +
-      '(args[0] === "https://ethgasstation.info/json/predictTable.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.ethGasPredictTable + '\')) }); } else if ' +
-      '(args[0].match(/chromeextensionmm/)) { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.metametrics + '\')) }); } else if ' +
-      '(args[0] === "https://dev.blockscale.net/api/gasexpress.json") { return ' +
-      'Promise.resolve({ json: () => Promise.resolve(JSON.parse(\'' + fetchMockResponses.gasExpress + '\')) }); } ' +
-      'return window.origFetch(...args); };' +
-      'function cancelInfuraRequest(requestDetails) {' +
-        'console.log("Canceling: " + requestDetails.url);' +
-        'return {' +
-          'cancel: true' +
-        '};' +
-     ' }' +
-      'window.chrome && window.chrome.webRequest && window.chrome.webRequest.onBeforeRequest.addListener(' +
-        'cancelInfuraRequest,' +
-        '{urls: ["https://*.infura.io/*"]},' +
-        '["blocking"]' +
-      ');'
-    )
+    await setupFetchMocking(driver)
   })
 
   afterEach(async function () {