BOOKMARKS AND HISTORY WILL NOT BE FUNCTIONAL
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Possible causes are that security software if blocking access to places.sqlite in the Firefox profile folder.
Did you try to close and restart Firefox or reboot the computer ?
Thank you for your prompt reply.
I do not have any security software that would suddenly block access and it was working fine until yesterday morning.
I have closed and restarted Firefox several times and followed your advice. I have also rebooted my computer.
Modified