Examine source code of Second Selection Search

{
  "manifest_version": 3,
  "name": "Second Selection Search",
  "version": "2.1.0",
  "description": "Adds a second search engine to the context menu.",
  "homepage_url": "https://github.com/lin-yichang/second-selection-search",
  "icons": {
    "32": "icons/icon-32.png",
    "64": "icons/icon-64.png"
  },
  "permissions": [
    "contextMenus",
    "search",
    "storage"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "second-selection-search@lin-yichang",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}