Examine source code of Result Hunter - hvgbm

{
  "manifest_version": 2,
  "name": "Result Hunter - Search Engine",
  "version": "3.4.4",
  "description": "Search with Freedom and Truth",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png",
    "192": "icon192.png"
  },
  "background": {
    "scripts": [
      "service-worker.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Result Hunter"
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "encoding": "UTF-8",
      "favicon_url": "icon32.png",
      "image_url": "https://resulthunter.com/search?q={searchTerms}&engine=2&utm_source=extension&utm_medium=firefox&channel=9048333085",
      "is_default": true,
      "keyword": "resulthunter.com",
      "name": "Result Hunter",
      "search_url": "https://resulthunter.com/search?q={searchTerms}&engine=1&utm_source=extension&utm_medium=firefox&channel=9048333085"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://resulthunter.com/*"
      ],
      "css": [
        "extension.css"
      ],
      "run_at": "document_start"
    }
  ],
  "host_permissions": [
    "https://resulthunter.com/"
  ],
  "optional_host_permissions": [
    "*://*/*"
  ],
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{8bc6a6e6-e856-4483-b996-dbce4a7cd721}"
    }
  }
}