Examine source code of Flash Fill

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Flash Fill",
  "version": "1.1.0",
  "description": "Autofills forms using Regex patterns and Fixed ID rules.",
  "icons": {
    "16": "assets/icons/icon16.png",
    "32": "assets/icons/icon32.png",
    "48": "assets/icons/icon48.png",
    "128": "assets/icons/icon128.png"
  },
  "minimum_chrome_version": "102",
  "permissions": [
    "activeTab",
    "storage",
    "downloads",
    "scripting"
  ],
  "host_permissions": [],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "background": {
    "service_worker": "src/background.js"
  },
  "action": {
    "default_popup": "src/popup.html",
    "default_title": "Flash Fill",
    "default_icon": {
      "16": "assets/icons/icon16.png",
      "32": "assets/icons/icon32.png",
      "48": "assets/icons/icon48.png",
      "128": "assets/icons/icon128.png"
    }
  },
  "options_ui": {
    "page": "src/options.html",
    "open_in_tab": true
  },
  "commands": {
    "trigger_autofill": {
      "suggested_key": {
        "default": "Ctrl+Shift+F",
        "mac": "MacCtrl+Shift+F"
      },
      "description": "Fill active form (Fixed IDs)"
    },
    "trigger_regex_autofill": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y",
        "mac": "MacCtrl+Shift+Y"
      },
      "description": "Fill active form (Regex)"
    }
  }
}