Examine source code of Custom Context Search

{
  "manifest_version": 2,
  "name": "Custom Context Search",
  "version": "3.0",
  "description": "Right-click search with customizable engines and integrated multi-search",
  "applications": {
    "gecko": {
      "id": "{ca833326-ddf1-48e4-a8a8-d5af95cf4969}",
      "strict_min_version": "58.0"
    }
  },
  "permissions": [
    "contextMenus",
    "storage",
    "activeTab",
    "downloads"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "options.html",
    "default_icon": {
      "16": "icons/search-icon.png",
      "32": "icons/search-icon-32.png",
      "64": "icons/search-icon-64.png",
      "128": "icons/search-icon-128.png"
    }
  },
  "commands": {
    "open-search-popup": {
      "suggested_key": {
        "default": "Ctrl+Shift+F"
      },
      "description": "Open the search popup"
    }
  },
  "icons": {
    "16": "icons/search-icon.png",
    "32": "icons/search-icon-32.png",
    "64": "icons/search-icon-64.png",
    "128": "icons/search-icon-128.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  }
}