Examine source code of YouTube Tracker

{
  "manifest_version": 2,
  "name": "YouTube Tracker",
  "short_name": "YTTracker",
  "description": "This extension will track your time on YouTube",
  "version": "2.3.0",
  "icons": {
    "16": "assets/icon16.png",
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  },
  "applications": {
    "gecko": {
      "id": "yttracker@mrcraftcod.fr"
    }
  },
  "author": "MrCraftCod",
  "homepage_url": "https://github.com/RakSrinaNa/YTTracker",
  "permissions": [
    "https://www.youtube.com/*",
    "https://yttracker.mrcraftcod.fr/*",
    "storage",
    "downloads",
    "notifications",
    "unlimitedStorage",
    "identity"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_icon": "assets/icon128.png",
    "default_title": "YoutubeTracker",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*",
        "https://yttracker.mrcraftcod.fr/*"
      ],
      "js": [
        "lib/jquery/jquery.min.js",
        "js/YTTUtils.js",
        "js/content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "lib/jquery/jquery.min.js",
      "js/YTTUtils.js",
      "js/background.js"
    ]
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "web_accessible_resources": [
    "js/YTTUtils.js",
    "js/hookerUtils.js",
    "js/hooker.js"
  ]
}