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

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Starting Up Firefox

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I have been using Firefox for years. Love it. Last night for the first time I received the following notice:

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

Close Fire fox or Cancel

I tried many different things. Stopping the process. Closed all windows. Tried a new install but did not delete the prior install. Same notice. Every time. Had to go to another Browser to get work done. Rather keep working with Firefox.

I am fearful of uninstall because of all my bookmarks. So hard to recreate all the bookmarks.

Thoughts on what is going on?

Thank you

Oliver Mills

I have been using Firefox for years. Love it. Last night for the first time I received the following notice: Firefox is already running but is not responding. The old Firefox process must be closed to open a new window. Close Fire fox or Cancel I tried many different things. Stopping the process. Closed all windows. Tried a new install but did not delete the prior install. Same notice. Every time. Had to go to another Browser to get work done. Rather keep working with Firefox. I am fearful of uninstall because of all my bookmarks. So hard to recreate all the bookmarks. Thoughts on what is going on? Thank you Oliver Mills

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See:

You may have to remove the parent.lock file in the profile folder.