Ubuntu環境下打開Firefox報錯: Firefox is already running, but is not responding.

在ubuntu下啟動firefox可能會報錯 Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.

解決辦法：在終端輸入killall firefox

在該命令殺死firefox所有進程后，再點開firefox就可以正常啟動了。