Examine source code of Search Groups

{
  "manifest_version": 2,
  "name": "Search Groups",
  "description": "Type 'sg' to search multiple installed engines at once.",
  "developer": {
    "name": "Nathaniel Jones",
    "url": "https://github.com/NJ0nes/searchgroups"
  },
  "version": "1.0",
  "permissions": [
    "tabs",
    "search",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "omnibox": {
    "keyword": "sg"
  },
  "options_ui": {
    "page": "/preferences/index.html",
    "open_in_tab": true
  },
  "icons": {
    "48": "/icons/icon48.png",
    "96": "/icons/icon96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c265e0fe-9b45-4de5-9d46-b3bbc1527ec4}",
      "strict_min_version": "78.0"
    }
  }
}