Examine source code of Twitch Chat Filter

{
  "manifest_version": 2,
  "name": "twitch-chat-filter",
  "version": "1.1",
  "description": "Allows custom filtering of twitch chat messages.",
  "icons": {
    "48": "icons/icon.svg"
  },
  "permissions": [
    "activeTab",
    "notifications",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/icon.svg",
    "default_title": "TwitchChatFilter"
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.twitch.tv/*"
      ],
      "js": [
        "main.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b82a6709-0a1c-4559-8c28-dfeb51625d0d}"
    }
  }
}