Examine source code of URL Forge

{
  "manifest_version": 2,
  "name": "URL Forge",
  "version": "1.0.5",
  "description": "Modify URL query parameters, find & replace URL parts, and apply custom rules — then open the result in a new tab.",
  "browser_specific_settings": {
    "gecko": {
      "id": "url-forge@extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "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"
  }
}