diff --git a/manual-chrome-launcher.js b/manual-chrome-launcher.js
index b780601b9..6eda698b8 100755
--- a/manual-chrome-launcher.js
+++ b/manual-chrome-launcher.js
@@ -1,6 +1,9 @@
 #!/usr/bin/env node
 
 'use strict';
+// Keep this file in sync with lighthouse
+// TODO: have LH depend on this one.
+
 /**
  * @fileoverview Script to launch a clean Chrome instance on-demand.
  *
@@ -17,21 +20,20 @@ require('./compiled-check.js')('./dist/chrome-launcher.js');
 const {Launcher, launch} = require('./dist/chrome-launcher');
 
 const args = process.argv.slice(2);
-let chromeFlags = [];
+const chromeFlags = [];
 let startingUrl;
 let port;
-let shouldEnableExtensions;
 let ignoreDefaultFlags;
 
 if (args.length) {
   const providedFlags = args.filter(flag => flag.startsWith('--'));
 
   const portFlag = providedFlags.find(flag => flag.startsWith('--port='));
-  port = portFlag && parseInt(portFlag.replace('--port=', ''), 10);
+  if (portFlag) port = parseInt(portFlag.replace('--port=', ''), 10);
 
-  shouldEnableExtensions = !!providedFlags.find(flag => flag === '--enable-extensions');
+  const enableExtensions = !!providedFlags.find(flag => flag === '--enable-extensions');
   // The basic pattern for enabling Chrome extensions
-  if (shouldEnableExtensions) {
+  if (enableExtensions) {
     ignoreDefaultFlags = true;
     chromeFlags.push(...Launcher.defaultFlags().filter(flag => flag !== '--disable-extensions'));
   }
@@ -45,4 +47,6 @@ launch({
   port,
   ignoreDefaultFlags,
   chromeFlags,
-}).then(v => console.log(`✨  Chrome debugging port: ${v.port}`));
+})
+// eslint-disable-next-line no-console
+.then(v => console.log(`✨  Chrome debugging port: ${v.port}`));