Examine source code of Google Meet Easy Mute

{
  "manifest_version": 2,
  "default_locale": "en",
  "name": "__MSG_appName__",
  "short_name": "__MSG_appShortName__",
  "description": "__MSG_appDesc__",
  "version": "1.5.2",
  "author": "010 Pixel",
  "permissions": [
    "https://meet.google.com/**-**-**",
    "storage"
  ],
  "browser_action": {
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png"
    },
    "default_title": "__MSG_appBrowserActionDefaultTitle__"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "content_scripts": [
    {
      "all_frames": true,
      "matches": [
        "https://meet.google.com/**-**-**"
      ],
      "js": [
        "js/_myapp.js"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "16": "images/icon16.png",
    "19": "images/icon19.png",
    "24": "images/icon24.png",
    "32": "images/icon32.png",
    "38": "images/icon38.png",
    "48": "images/icon48.png",
    "64": "images/icon64.png",
    "96": "images/icon96.png",
    "128": "images/icon128.png"
  }
}