Examine source code of Image Search Options V2

{
  "manifest_version": 2,
  "name": "Image Search Options V2",
  "version": "1.3",
  "description": "Adds context menu items for reverse image search using multiple engines.",
  "permissions": [
    "contextMenus",
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "action": {
    "default_popup": "options.html",
    "default_icon": {
      "32": "icons/logo_32.png",
      "64": "icons/logo_64.png",
      "128": "icons/logo_128.png"
    }
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{165a1698-ec03-4617-8f48-1dfff14cddd3}"
    }
  }
}