diff --git a/.eslintrc.js b/.eslintrc.js
index c992f3b2da..e45109a0d2 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -78,7 +78,12 @@ module.exports = {
         "no-duplicate-imports": "error",
         "no-var": "error",
         "prefer-const": "error",
-        "array-bracket-spacing": "error"
+        "array-bracket-spacing": "error",
+        "space-before-function-paren": ["error", {
+            "anonymous": "always",
+            "named": "never",
+            "asyncArrow": "always",
+        }],
     },
     "settings": {
         "react": {
diff --git a/src/common/summarize-profile.js b/src/common/summarize-profile.js
index a1a7ad245e..1d0207e058 100644
--- a/src/common/summarize-profile.js
+++ b/src/common/summarize-profile.js
@@ -67,7 +67,7 @@ const categories = [
   // [match.prefix, 'Interpret(', 'script.interpreter',
 ];
 
-export function summarizeProfile (profile) {
+export function summarizeProfile(profile) {
   const categories = categorizeThreadSamples(profile);
   const rollingSummaries = calculateRollingSummaries(profile, categories);
   const summaries = summarizeCategories(profile, categories);
@@ -178,7 +178,7 @@ function calculateSummaryPercentages(summary) {
 }
 
 
-function logUncategorizedSamples (uncategorized, maxLogLength = 10) {
+function logUncategorizedSamples(uncategorized, maxLogLength = 10) {
   const entries = Object.entries(uncategorized);
   /* eslint-disable no-console */
   console.log(`Top ${maxLogLength} uncategorized stacks`);
@@ -197,7 +197,7 @@ function logUncategorizedSamples (uncategorized, maxLogLength = 10) {
  * @param {array} profile - The current profile.
  * @returns {array} Stacks mapped to categories.
  */
-export function categorizeThreadSamples (profile) {
+export function categorizeThreadSamples(profile) {
   const uncategorized = {};
   const summaries = profile.threads.map(thread => (
     thread.samples.stack
@@ -218,7 +218,7 @@ export function categorizeThreadSamples (profile) {
  * @param {object} threadCategories - Each thread's categories for the samples.
  * @returns {object} The summaries of each thread.
  */
-export function summarizeCategories (profile, threadCategories) {
+export function summarizeCategories(profile, threadCategories) {
   return threadCategories.map(categories => (
       categories.reduce(summarizeSampleCategories, {})
     ))
@@ -227,7 +227,7 @@ export function summarizeCategories (profile, threadCategories) {
     // .sort((a, b) => Object.keys(b.summary).length - Object.keys(a.summary).length);
 }
 
-export function calculateRollingSummaries (profile, threadCategories, segmentCount = 40, rolling = 4) {
+export function calculateRollingSummaries(profile, threadCategories, segmentCount = 40, rolling = 4) {
   const [minTime, maxTime] = profile.threads.map(thread => {
     return [thread.samples.time[0], thread.samples.time[thread.samples.time.length - 1]];
   })
@@ -271,7 +271,7 @@ export function calculateRollingSummaries (profile, threadCategories, segmentCou
   });
 }
 
-function times (n, fn) {
+function times(n, fn) {
   const results = Array(n);
   for (let i = 0; i < n; i++) {
     results[i] = fn(i);
@@ -279,7 +279,7 @@ function times (n, fn) {
   return results;
 }
 
-function mapObj (object, fn) {
+function mapObj(object, fn) {
   let i = 0;
   const mappedObj = {};
   for (const key in object) {
diff --git a/src/common/test/summarize-profile.js b/src/common/test/summarize-profile.js
index 7e62b0e45e..ea0816924a 100644
--- a/src/common/test/summarize-profile.js
+++ b/src/common/test/summarize-profile.js
@@ -113,7 +113,7 @@ describe('summarize-profile', function () {
   });
 });
 
-function forEachObj (object, fn) {
+function forEachObj(object, fn) {
   let i = 0;
   for (const key in object) {
     if (object.hasOwnProperty(key)) {
diff --git a/src/content/actions/index.js b/src/content/actions/index.js
index 620d466ad3..c4c25f0060 100644
--- a/src/content/actions/index.js
+++ b/src/content/actions/index.js
@@ -61,7 +61,7 @@ export function startSymbolicating() {
 }
 
 export function doneSymbolicating() {
-  return function(dispatch, getState) {
+  return function (dispatch, getState) {
     dispatch({ type: 'DONE_SYMBOLICATING' });
     // TODO - Do not use selectors here.
     dispatch({
diff --git a/src/content/components/SummarizeLineGraph.js b/src/content/components/SummarizeLineGraph.js
index ab990103e6..544eb4419a 100644
--- a/src/content/components/SummarizeLineGraph.js
+++ b/src/content/components/SummarizeLineGraph.js
@@ -121,14 +121,14 @@ SummarizeLineGraph.propTypes = {
 
 export default SummarizeLineGraph;
 
-function round (n) {
+function round(n) {
   return Math.round(n * 1000) / 1000;
 }
 
-function moveTo (x, y) {
+function moveTo(x, y) {
   return `M${x},${y}`;
 }
 
-function lineTo (x, y) {
+function lineTo(x, y) {
   return `L${x},${y}`;
 }
diff --git a/src/content/components/SummarizeProfileExpand.js b/src/content/components/SummarizeProfileExpand.js
index 91f8d72be6..11e1b8e364 100644
--- a/src/content/components/SummarizeProfileExpand.js
+++ b/src/content/components/SummarizeProfileExpand.js
@@ -2,7 +2,7 @@ import React, { Component, PropTypes } from 'react';
 import SummarizeLineGraph from './SummarizeLineGraph';
 
 class SummarizeProfileExpand extends Component {
-  render () {
+  render() {
     const {summary, thread, isExpanded, expand, collapse, expandLength} = this.props;
     // Only show the expand/collapse button when it is warranted.
     if (summary.length > expandLength) {
diff --git a/src/content/components/SummarizeProfileHeader.js b/src/content/components/SummarizeProfileHeader.js
index b83e6b9eee..c3fd57f332 100644
--- a/src/content/components/SummarizeProfileHeader.js
+++ b/src/content/components/SummarizeProfileHeader.js
@@ -12,7 +12,7 @@ const PERCENT_TIME_TITLE = 'The percentage of time represents the percentage of
   'recording.';
 
 class SummarizeProfileHeader extends Component {
-  render () {
+  render() {
     const {threadName} = this.props;
     return (
       <div>
diff --git a/src/content/components/SummarizeProfileThread.js b/src/content/components/SummarizeProfileThread.js
index 74178b178e..f6a26d873e 100644
--- a/src/content/components/SummarizeProfileThread.js
+++ b/src/content/components/SummarizeProfileThread.js
@@ -35,7 +35,7 @@ export default SummarizeProfileThread;
  * @param {number} n - The number.
  * @returns {string} The formatted string.
  */
-function displayPercentage (n) {
+function displayPercentage(n) {
   const percentage = Math.round(n * 1000);
   const integer = Math.floor(percentage / 10);
   const decimal = Math.floor(percentage - integer * 10);
diff --git a/src/content/containers/ProfileSummaryView.js b/src/content/containers/ProfileSummaryView.js
index 4e6ca5c358..6ca47e532b 100644
--- a/src/content/containers/ProfileSummaryView.js
+++ b/src/content/containers/ProfileSummaryView.js
@@ -89,7 +89,7 @@ ProfileSummaryView.propTypes = {
   expandProfileSummaryThread: PropTypes.func,
 };
 
-function fill (size, fn) {
+function fill(size, fn) {
   const array = Array(size);
   for (let i = 0; i < size; i++) {
     array[i] = fn(i);
diff --git a/src/content/gz.js b/src/content/gz.js
index 74cada266f..70fcaf6a33 100644
--- a/src/content/gz.js
+++ b/src/content/gz.js
@@ -5,7 +5,7 @@ import ZeeWorker from 'file-loader!./zee-worker.js';
 const zeeWorker = new Worker(ZeeWorker);
 const zeeCallbacks = [];
 
-zeeWorker.onmessage = function(msg) {
+zeeWorker.onmessage = function (msg) {
   zeeCallbacks[msg.data.callbackID][msg.data.type](msg.data.data);
   zeeCallbacks[msg.data.callbackID] = null;
 };
diff --git a/src/content/messages/index.js b/src/content/messages/index.js
index be5a8669a6..f39a1fbbe4 100644
--- a/src/content/messages/index.js
+++ b/src/content/messages/index.js
@@ -6,6 +6,6 @@ import { profileSummaryProcessed } from '../actions';
 const messages = {};
 export default messages;
 
-messages.PROFILE_SUMMARY_PROCESSED = function(message, call) {
+messages.PROFILE_SUMMARY_PROCESSED = function (message, call) {
   call(profileSummaryProcessed, message.summary);
 };
diff --git a/src/content/reducers/index.js b/src/content/reducers/index.js
index 334e551496..e70e9b3519 100644
--- a/src/content/reducers/index.js
+++ b/src/content/reducers/index.js
@@ -210,7 +210,7 @@ function profile(state = {}, action) {
   }
 }
 
-function summaryView (state = {summary: null, expanded: null}, action) {
+function summaryView(state = {summary: null, expanded: null}, action) {
   switch (action.type) {
     case 'PROFILE_SUMMARY_PROCESSED': {
       return Object.assign({}, state, { summary: action.summary, expanded: new Set() });
diff --git a/src/worker/actions/index.js b/src/worker/actions/index.js
index bcbb0b1470..398a3674b2 100644
--- a/src/worker/actions/index.js
+++ b/src/worker/actions/index.js
@@ -1,7 +1,7 @@
 import { summarizeProfile } from '../../common/summarize-profile';
 
-export function processProfileSummary () {
-  return function(dispatch, getState) {
+export function processProfileSummary() {
+  return function (dispatch, getState) {
     dispatch({
       toContent: true,
       type: 'PROFILE_SUMMARY_PROCESSED',
diff --git a/src/worker/messages/index.js b/src/worker/messages/index.js
index f4047b18b6..41ac31a8f4 100644
--- a/src/worker/messages/index.js
+++ b/src/worker/messages/index.js
@@ -7,10 +7,10 @@ import {processProfileSummary, profileProcessed} from '../actions';
 const messages = {};
 export default messages;
 
-messages.PROFILE_PROCESSED = function(message, call) {
+messages.PROFILE_PROCESSED = function (message, call) {
   call(profileProcessed, message.profile);
 };
 
-messages.SUMMARIZE_PROFILE = function(message, call) {
+messages.SUMMARIZE_PROFILE = function (message, call) {
   call(processProfileSummary);
 };