I have noticed that after using the browser for a while, that the Back and Forward buttons will stop responding. The only way around this is to close the browser and reopen it. I suspect that the history file may be causing the problem, but I am not 100% sure.

Reporter, could you specify your build ID?

Bug 126826 is not _exactly_ your problem but 1-2 bugreports with your problem are marked as dups of 126826.... You've CC'ed to bug 126826 so you can follow the progress made with the bug.. Thanks for using mozilla and reporting bugs! *** This bug has been marked as a duplicate of 126826 ***