Examine source code of Browser Tamer

{
  "name": "Browser Tamer",
  "version": "1.5",
  "manifest_version": 2,
  "description": "Integrates Browser Tamer with Gecko compatible browsers (like Firefox).",
  "icons": {
    "16": "icons/icon16x16.png",
    "48": "icons/icon48x48.png",
    "128": "icons/icon128x128.png",
    "192": "icons/icon192x192.png",
    "256": "icons/icon256x256.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "contextMenus",
    "contextualIdentities",
    "cookies"
  ],
  "browser_action": {
    "default_icon": "icons/icon192x192.png",
    "default_title": "Open this page with Browser Tamer"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "protocol_handlers": [
    {
      "protocol": "ext+bt",
      "name": "Browser Tamer",
      "uriTemplate": "/container.html#%s"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{69f5aa2c-ebb5-4755-abdd-459de0c7eb29}"
    }
  }
}