Examine source code of Translate Selected Text

{
  "manifest_version": 2,
  "name": "Translate Selected Text",
  "version": "1.2.2",
  "description": "Translate selected text without opening a new tab.",
  "browser_specific_settings": {
    "gecko": {
      "id": "translate_selected_text@example.com"
    }
  },
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "permissions": [
    "storage",
    "menus",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  }
}