message: fix(manifest): fix chrome 67 bug
diff: "all_frames": true
  },
  {
  - "js": ["content.js"],
  + "js": ["static/browser-polyfill.min.js", "content.js"],
  "css": ["content.css"],
  "matches": ["<all_urls>"]
  },
  {
  - "js": ["selection.js"],
  + "js": ["static/browser-polyfill.min.js", "selection.js"],
  "matches": ["<all_urls>"],
  "match_about_blank": true,
  "all_frames": true
  