Examine source code of No Bird App

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "No Bird App",
  "content_scripts": [
    {
      "matches": [
        "*://twitter.com/*",
        "*://tweetdeck.twitter.com/*"
      ],
      "js": [
        "main.js"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "48": "button/NoBirdApp.svg",
    "96": "button/NoBirdApp.svg"
  },
  "author": "Joona Myllyniemi (Bootlegger)",
  "url": "bootleggercodes.com",
  "description": "Hide Twitter.com and focus on what's important",
  "short_name": "NoBirdApp",
  "browser_specific_settings": {
    "gecko": {
      "id": "{86405f3e-d814-4bc7-b871-a3f3eef77c8c}"
    }
  }
}