Examine source code of Flash Player for YouTube™

{
  "version": "0.1.6resigned1",
  "manifest_version": 2,
  "short_name": "youtubetmflash",
  "name": "Flash Player for YouTube™",
  "permissions": [
    "storage",
    "<all_urls>"
  ],
  "background": {
    "page": "lib/background.html"
  },
  "description": "Watch YouTube Videos Only in Adobe Flash Player",
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*",
        "*://youtube.com/*"
      ],
      "js": [
        "data/content_script/inject.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "icons": {
    "16": "data/icon-16.png",
    "32": "data/icon-32.png",
    "48": "data/icon-48.png",
    "64": "data/icon-64.png",
    "128": "data/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "jid1-h7qSFwT2a1FJOp@jetpack"
    }
  }
}