Examine source code of Multiple Search and Highlight

{
  "manifest_version": 3,
  "version": "0.6.3",
  "name": "Multiple Search and Highlight",
  "description": "Highlight multiple words separated by comma, space or arbitrary separator with persistent history",
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "homepage_url": "https://webextension.org/listing/multiple-highlight.html",
  "background": {
    "service_worker": "worker.js",
    "scripts": [
      "data/popup/utils.js",
      "worker.js"
    ]
  },
  "action": {
    "default_popup": "data/popup/index.html"
  },
  "offline_enabled": true,
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png",
    "256": "data/icons/256.png",
    "512": "data/icons/512.png"
  },
  "commands": {
    "_execute_action": {},
    "remove_highlight": {
      "description": "Remove all highlights"
    },
    "ckey_highlight": {
      "description": "Highlight the last searched query without opening the extension's interface"
    }
  },
  "options_ui": {
    "page": "data/options/index.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f704468d-9a97-4e40-b573-2707a8248e1f}",
      "strict_min_version": "128.0"
    }
  }
}