Examine source code of Grey Vision

{
  "name": "Grey Vision",
  "version": "1.1.5resigned1",
  "manifest_version": 2,
  "description": "Removes all views, likes, and subscription numbers from youtube for a cleaner experience without pre-judgements.",
  "homepage_url": "http://www.TomLum.com/greyvision",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "default_locale": "en",
  "page_action": {
    "default_icon": "icons/icon128.png",
    "default_title": "Grey Vision",
    "default_popup": "src/page_action/page_action.html"
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "https://www.youtube.com/*"
      ],
      "css": [
        "src/inject/injectYoutube.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{297869d2-6236-4f89-84ce-240845031454}"
    }
  }
}