Examine source code of Better Tab Group

{
  "manifest_version": 3,
  "name": "UniGet Web Helper",
  "version": "3.9.0",
  "description": "IDM-style download button for UniGet",
  "icons": {
    "48": "icon48.png"
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "icon48.png",
        "icon.png"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "tabs",
    "scripting",
    "storage",
    "contextMenus",
    "notifications"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": false,
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "host_permissions": [
    "http://localhost:3000/*",
    "http://127.0.0.1:3000/*",
    "https://noembed.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8de714ab-ef84-40d0-a757-d8dffce21e9b}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}