Examine source code of Tools for MDN

{
  "manifest_version": 2,
  "name": "Tools for MDN",
  "version": "0.1",
  "description": "Opens your MDN Plus collection in a sidebar, allows you to search MDN Web docs from the address bar or from a context menu item (select text first).",
  "permissions": [
    "activeTab",
    "contextMenus"
  ],
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "sidebar_action": {
    "default_icon": {
      "192": "icons/icon32.png"
    },
    "default_title": "MDN Plus Collections",
    "default_panel": "sidebar.html"
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "MDN Web Docs",
      "keyword": "@MDN",
      "search_url": "https://developer.mozilla.org/en-US/search?q={searchTerms}"
    }
  },
  "background": {
    "scripts": [
      "sidebar.js",
      "wordsearch.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon32.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b1d68e2f-5be6-47c5-910f-45c798545ff9}"
    }
  }
}