Examine source code of Domain Search Everywhere

{
  "manifest_version": 2,
  "name": "Domigo – Domain Search Everywhere",
  "version": "1.0.0",
  "description": "Quickly check domain name availability directly from any webpage",
  "permissions": [
    "contextMenus",
    "activeTab",
    "storage",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_end"
    }
  ],
  "commands": {
    "add-to-search": {
      "suggested_key": {
        "default": "Ctrl+Shift+D"
      },
      "description": "Add selected text to domain search"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Domain Search Helper",
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "web_accessible_resources": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "domigo@domigo.dev",
      "strict_min_version": "109.0"
    }
  }
}