Firefox locks up when I try and delete history

Hi Rick

When you try to clear history and you have a significantly large history file to clear, it may take a few moments to delete.

That's not the problem. I delete daily and sometimes have very little history. Computer locks up as soon as I hit delete. Have waited several minutes, stays locked. Have to go to task manager to shutdown Firefox

See if some of the steps mentioned in support.mozilla.org/questions/1595066 would help you.

No help there???