Examine source code of OldGoogle Search

{
  "manifest_version": 2,
  "name": "OldGoogle Search",
  "version": "1.2",
  "description": "A search engine extension that lets you search with Google's classic designs from different years",
  "browser_specific_settings": {
    "gecko": {
      "id": "oldgoogle@utano.dev",
      "strict_min_version": "79.0"
    }
  },
  "icons": {
    "16": "icons/old_google_g_icon16.svg",
    "48": "icons/old_google_g_icon48.svg",
    "128": "icons/old_google_g_icon.svg"
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "OldGoogle",
      "search_url": "https://oldgoogle-search/?q={searchTerms}",
      "favicon_url": "icons/old_google_g_icon16.svg",
      "encoding": "UTF-8",
      "is_default": false
    }
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/old_google_g_icon16.svg",
      "32": "icons/old_google_g_icon16.svg",
      "48": "icons/old_google_g_icon48.svg",
      "128": "icons/old_google_g_icon.svg"
    },
    "default_title": "OldGoogle Search"
  },
  "background": {
    "scripts": [
      "background.js",
      "js/search.js"
    ]
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "*://oldgoogle-search/*",
    "*://oldgoogle-home/*"
  ],
  "web_accessible_resources": [
    "welcome.html",
    "css/*",
    "js/*",
    "images/*",
    "icons/*"
  ]
}