Examine source code of Downloader - Browser Integration

{
  "manifest_version": 3,
  "name": "Downloader — Browser Integration",
  "version": "1.1.0",
  "description": "Adds 'Download with Downloader', captures video/audio/HLS media, and sends links to the Downloader desktop app.",
  "browser_specific_settings": {
    "gecko": {
      "id": "downloader-integration@bezzad",
      "strict_min_version": "121.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "contextMenus",
    "webRequest",
    "tabs",
    "scripting",
    "notifications",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>",
    "http://127.0.0.1:15151/*",
    "http://localhost:15151/*"
  ],
  "background": {
    "scripts": [
      "common.js",
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Downloader",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}