Examine source code of MeetInOne

{
  "short_name": "MeetInOne Launcher",
  "description": "Extension to auto-launch your MeetInOne application when you need it.",
  "icons": {
    "16": "16x16.png",
    "48": "48x48.png",
    "128": "128x128.png"
  },
  "start_url": ".",
  "display": "standalone",
  "theme_color": "#000000",
  "background_color": "#ffffff",
  "name": "MeetInOne Launcher",
  "version": "0.1.3",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "https://*.meet.google.com/*"
      ],
      "run_at": "document_start",
      "all_frames": false,
      "js": [
        "content.js"
      ]
    }
  ],
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b8c65c4b-0d8e-4ef6-8eea-9890db0a92d6}"
    }
  }
}