Examine source code of @Mention Searcher

{
  "manifest_version": 2,
  "name": "@Mention Searcher",
  "version": "1.1",
  "description": "Find @mentions on a page and search them across multiple sites",
  "permissions": [
    "contextMenus",
    "activeTab",
    "storage",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "mention-searcher@example.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  }
}