Examine source code of Blue Shield Grabber

{
  "manifest_version": 2,
  "name": "ShieldGrabber",
  "version": "2.2",
  "description": "Firefox extension to grab Google Meet blue shield (host controls) before the meeting creator.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "icons/icon.png",
    "default_title": "ShieldGrabber",
    "default_popup": "popup/index.html"
  },
  "page_action": {
    "default_icon": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://classroom.google.com/*"
      ],
      "js": [
        "scripts/shieldgrabber.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "permissions": [
    "storage",
    "notifications",
    "tabs",
    "webRequest",
    "*://classroom.google.com/*/querycourse*"
  ],
  "options_ui": {
    "page": "options/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "addon@shieldgrabber.com"
    }
  }
}