Examine source code of History Forget

{
  "manifest_version": 3,
  "name": "History Forget",
  "version": "1.2.1",
  "description": "Erases the history entry for any page whose URL, title or visible text matches rules you set — by domain, keyword, or regex.",
  "permissions": [
    "history",
    "storage",
    "tabs",
    "webNavigation",
    "scripting",
    "browsingData"
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "exclude_matches": [
        "*://*/*.pdf"
      ],
      "js": [
        "content/content.js"
      ],
      "css": [
        "content/content.css"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "action": {
    "default_title": "History Forget",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    }
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{01f3ec7b-804b-40c8-9a36-a90f24140c1e}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}