Examine source code of Gamelites

{
  "manifest_version": 2,
  "name": "Gamelites",
  "version": "0.3resigned1",
  "description": "Extend Twitch's VOD player to include Gamelites' highlights",
  "icons": {
    "48": "icon.png",
    "96": "icon@2x.png"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "run_at": "document_start",
      "matches": [
        "*://www.twitch.tv/videos/*",
        "*://player.twitch.tv/*"
      ],
      "js": [
        "inject.js"
      ],
      "css": [
        "gamelites.css"
      ]
    }
  ],
  "permissions": [
    "*://*.gamelites.tv/*",
    "webRequest"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{81106796-8386-4871-ad84-471a213b27dd}"
    }
  }
}