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I cannot use firefox because of the error:

Firefox Performances et connectivité
cor-el a répondu
Roger Ulrich
Roger Ulrich

Whenever I try to use firefox I get the message:

Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window.

There is no firefox running and all I can do is close the windows. Pressing the on-screen button "Close Firefox" does nothing except for the error message to be reposted. I have to press the upper-right X to close the window.

Whenever I try to use firefox I get the message: Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window. There is no firefox running and all I can do is close the windows. Pressing the on-screen button "Close Firefox" does nothing except for the error message to be reposted. I have to press the upper-right X to close the window.

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cor-el
cor-el
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You can check this article.