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The bookmarks and history system will not be functional because one of Firefox's files is in use by another application. Some security software can cause this problem

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Upon opening Firefox, I get a red banner across the top saying:

The bookmarks and history system will not be functional because one of Firefox's files is in use by another application. Some security software can cause this problem

I cannot use the back and forward buttons, either.

I have tried all the solutions in your troubleshooting page, and have even uninstalled and reinstalled Firefox. Nothing works.

Upon opening Firefox, I get a red banner across the top saying: The bookmarks and history system will not be functional because one of Firefox's files is in use by another application. Some security software can cause this problem I cannot use the back and forward buttons, either. I have tried all the solutions in your troubleshooting page, and have even uninstalled and reinstalled Firefox. Nothing works.

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