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Firefox is already running,實際後臺查不到程序了

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.”

解決方法如下:
在linux的終端輸入:firefox -profilemanager

回車後會出現一個小視窗讓你選擇使用哪個 profile 來啟動 firefox。

首先將當前出錯的Profile刪除掉,然後新建下即可。