Examine source code of Cal.com Companion

{
  "manifest_version": 2,
  "name": "Cal.com Companion",
  "description": "Your calendar companion for quick booking and scheduling",
  "version": "1.7.5",
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "identity",
    "https://companion.cal.com/*",
    "https://api.cal.com/*",
    "https://app.cal.com/*",
    "https://mail.google.com/*",
    "https://calendar.google.com/*"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'; frame-src 'self' https://companion.cal.com",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "companion@cal.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "browser_action": {
    "default_title": "Cal.com Companion",
    "default_icon": {
      "16": "icon-16.png",
      "48": "icon-48.png",
      "128": "icon-128.png"
    }
  }
}