Examine source code of HitMeUp for GitHub

{
  "manifest_version": 3,
  "name": "HitMeUp for GitHub",
  "version": "1.4.37",
  "description": "Send and receive private, end-to-end encrypted messages with any GitHub user, directly on their profile page.",
  "host_permissions": [
    "https://hubpulse-for-github.onrender.com/*",
    "https://github.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "icons": {
    "16": "public/icon16.png",
    "48": "public/icon48.png",
    "128": "public/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*"
      ],
      "js": [
        "github.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "public/notification.wav"
      ],
      "matches": [
        "https://github.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "hitmeup-github@winter262005",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}