Examine source code of Porkchat

{
  "manifest_version": 2,
  "name": "Porkchat",
  "description": "Greater functionality and usability in Stack Exchange Chat",
  "version": "1.0.21resigned1",
  "web_accessible_resources": [
    "porkchat.js",
    "inject.js",
    "ponies.css",
    "fixed-width.css",
    "dark.css",
    "global.css",
    "icon_128.png",
    "icon_white.png",
    "options.html",
    "info.html",
    "imgs/*",
    "flame.png",
    "sprites.png"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://chat.meta.stackexchange.com/rooms/*",
        "*://chat.stackexchange.com/rooms/*",
        "*://chat.stackoverflow.com/rooms/*",
        "*://chat.meta.stackexchange.com/messages/*/history",
        "*://chat.stackexchange.com/messages/*/history",
        "*://chat.stackoverflow.com/messages/*/history"
      ],
      "exclude_matches": [
        "*://chat.meta.stackexchange.com/rooms/info/*",
        "*://chat.stackexchange.com/rooms/info/*",
        "*://chat.stackoverflow.com/rooms/info/*",
        "*://chat.meta.stackexchange.com/rooms",
        "*://chat.stackexchange.com/rooms",
        "*://chat.stackoverflow.com/rooms"
      ],
      "js": [
        "inject.js"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "16": "icon_16.png",
    "48": "icon_48.png",
    "128": "icon_128.png"
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "porkchat@mamota.net"
    }
  }
}