Windows 10 reached EOS (end of support) on October 14, 2025. For more information, see this article.

Mozilla サポートの検索

サポート詐欺に注意してください。 私たちはあなたに通話やショートメッセージの送信、個人情報の共有を求めることはありません。疑わしい行為を見つけたら「迷惑行為を報告」からご報告ください。

詳しく学ぶ

このスレッドは閉じられ、アーカイブに保管されました。 必要であれば新たに質問してください。

Firefox thinks there's another instance running, but not true

  • 2 件の返信
  • 0 人がこの問題に困っています
  • 118 回表示
  • 最後の返信者: SuMo Bot

more options

I cannot use, update, uninstall, refresh, or reinstall Firefox (and haven't for four or more years). I always get this message: "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window." But I have (obviously) shut down the computer entirely any number of times in all those years. What can I do? I will be taking college classes and Firefox is one of the few browsers that the college supports.

I cannot use, update, uninstall, refresh, or reinstall Firefox (and haven't for four or more years). I always get this message: "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window." But I have (obviously) shut down the computer entirely any number of times in all those years. What can I do? I will be taking college classes and Firefox is one of the few browsers that the college supports.

すべての返信 (3)

more options

選ばれた解決策

more options

Thank you so much. It was the parent.lock file. I was able to refresh Firefox. Just took a few moments.

more options

This question has been locked because the original author has deleted their account. While you can no longer post new replies, the existing content remains available for reference.