Examine source code of Search-Select

{
  "manifest_version": 2,
  "name": "Search-Select",
  "version": "1.1",
  "description": "Shows a popup when text is selected, allowing quick searches on Wikipedia, Wiktionary, and Google. Newly added search DuckDuckGo and fixed styling issue on many websites with the use of shadow DOM.",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "icons/wikipedia.svg",
    "icons/wiktionary.svg",
    "icons/google.svg",
    "icon/duckduckgo.svg"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "selection-search@addon",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}