Examine source code of MetaMaster

{
  "manifest_version": 2,
  "name": "xIFr",
  "version": "2.12.0",
  "default_locale": "en",
  "description": "__MSG_extensionDescription__",
  "author": "Stig Nygaard",
  "homepage_url": "https://github.com/StigNygaard/xIFr",
  "icons": {
    "24": "icons/xIFr-24.png",
    "32": "icons/xIFr-32.png",
    "48": "icons/xIFr-48.png",
    "64": "icons/xIFr-64.png",
    "96": "icons/xIFr-96.png",
    "128": "icons/xIFr-128.png",
    "256": "icons/xIFr-256.png",
    "512": "icons/xIFr-512.png"
  },
  "browser_action": {},
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "109.0",
      "id": "{4b00bd0b-05e9-4973-ac6a-ffb9f3c06ccd}"
    }
  },
  "minimum_chrome_version": "109.0",
  "minimum_opera_version": "95.0",
  "minimum_edge_version": "109.0",
  "permissions": [
    "<all_urls>",
    "contextMenus",
    "menus",
    "storage"
  ],
  "content_security_policy": "script-src 'self'; object-src 'none'",
  "background": {
    "scripts": [
      "lib/mozilla/browser-polyfill.js",
      "context.js",
      "backgroundscript.js"
    ],
    "persistent": false
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true,
    "chrome_style": true,
    "open_in_tab": true
  }
}