Use es6 string templating

lib/renderer/content-scripts-injector.js

@@ -6,7 +6,7 @@ const {runInThisContext} = require('vm')
 const matchesPattern = function (pattern) {
   if (pattern === '<all_urls>') return true
   const regexp = new RegExp('^' + pattern.replace(/\*/g, '.*') + '$')
-  const url = location.protocol + '//' + location.host + location.pathname
+  const url = `${location.protocol}//${location.host}${location.pathname}`
   return url.match(regexp)
 }