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Firefox bookmarks disappeared on my Mac Mini

I got this warning strip when I opened Firefox on my Mac Mini "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".


Could Mac Catalina security software be interfering with firefox bookmarks? or has this happened to anyone else. I've switched back over to Safari, and checked constantly today to make sure nothing of any monetary importance was tampered with.


Mac Mini (late 2014)

Catalina 10.15.5


Any thoughts on this would be appreciated.

Posted on Jul 6, 2020 5:17 PM

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Posted on Jul 6, 2020 6:30 PM

Firefox/Mozilla has a fix for this (the first thing they suggest is restart your computer, but if that doesn't bring things back, they have a manual process to restore your bookmarks):


https://support.mozilla.org/en-US/kb/fix-bookmarks-and-history-will-not-be-functional

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Firefox bookmarks disappeared on my Mac Mini

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