Examine source code of Meets Cinema Mode

{
  "manifest_version": 2,
  "name": "Meets Cinema Mode",
  "version": "1.0",
  "description": "Cinema mode for Google Meets, removes extra UI elements and makes the video full screen.",
  "icons": {
    "48": "img/icon48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b897cec9-a6a1-4317-88b1-109dfc6416c9}"
    }
  }
}