Examine source code of Custom Bang Search

{
  "manifest_version": 3,
  "name": "Custom Bang Search",
  "version": "0.11.4",
  "description": "Use custom DuckDuckGo-style bangs directly from the address bar",
  "icons": {
    "96": "images/icons/icon_96.png",
    "128": "images/icons/icon_128.png"
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "webRequest",
    "webRequestBlocking"
  ],
  "host_permissions": [
    "*://www.google.com/*",
    "*://*.bing.com/*",
    "*://*.duckduckgo.com/*",
    "*://*.ecosia.org/*",
    "*://*.brave.com/*",
    "*://*.metager.org/*",
    "*://*.mojeek.com/*",
    "*://searx.tiekoetter.com/*",
    "*://*.startpage.com/*",
    "*://searx.be/*",
    "*://kagi.com/*"
  ],
  "options_ui": {
    "page": "src/configui/config.html",
    "open_in_tab": true
  },
  "action": {
    "default_icon": {
      "96": "images/icons/icon_96.png",
      "128": "images/icons/icon_128.png"
    },
    "default_title": "Custom Bang Search",
    "default_popup": "src/popup/popup.html"
  },
  "background": {
    "scripts": [
      "src/background/main.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b67c3a9a-b2a2-4fca-af95-7e7a38f3822e}"
    }
  }
}