I think one of your Firefox files was corrupted.

Download Firefox Full Installer All languages {web link}

If you have any more trouble, Please post all of your crash reports for the last week.

I think you're correct. I subsequently tried a re-installation, which worked, except all my tabs, sessions, add-ons, etc. were lost. I got some back after I found a folder marked "old firefox data" on the desktop that had the corrupted profile, but not all.

I have had the profile file get corrupted before, once or twice, and I'm not sure what causes it. It's certainly a pain.

Thanks!

These add-ons can be a great help by backing up and restoring Firefox

FEBE (Firefox Environment Backup Extension) {web link} FEBE allows you to quickly and easily backup your Firefox extensions, history, passwords, and more. In fact, it goes beyond just backing up -- It will actually rebuild your saved files individually into installable .xpi files. It will also make backup of files that you choose.

OPIE {web link} Import/Export extension preferences

Thanks! I'll give them a try.