Perform the suggestions mentioned in the following articles:

• Configuring Session Restore
• Restore Default Toolbar set
• Determining if Firefox has created a new Profile
• Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

Check and tell if its working.

May not be related to your problem but some of your Firefox Plugins are out-dated

• Update All your Firefox Plugins -> https://www.mozilla.org/en-US/plugincheck/
• When Downloading Plugins Update setup files, Remove Checkmark from Downloading other Optional Softwares with your Plugins (e.g. Toolbars, McAfee, Google Chrome, etc.)

I don't think session restore is what I want here; I was expecting my old session to reload because that's what always happened previously when I've installed the latest version of Firefox and it has therefore needed to restart, and what has happened when Firefox crashes. I don't want it to always open my old session, I just want it to open my old session when it crashes or restarts.

Restoring the default toolbar set didn't really do much for me; I did realize after posting the question that my bookmarks toolbar had gone away, but it seems that the way to get it back (temporarily, because this only works in the window I do it in, and has no effect on new windows) is to go to View>>Toolbars and deselect/reselect everything I want to see.

I checked the profiles folder, and I only have one.

I also updated all of the outdated plugins.

I'm now going to try running Firefox in Safe Mode and will report back.

So, I opened Firefox in Safe Mode, and it reloaded my old session.

Will update when I figure out which extension is causing the problem.

It would appear that the problematic addon was Facebook Disconnect 2.0.2 . Hope this helps any others who were also having this problem.

Firefox 10 has many problems and I found the solution did an update to firefox 11 beta and so far everything is working well.

Glad to see its working.

To help other users find solutions, click on the "Solved It" button Next to the Reply that BEST solved your Question

Please DO NOT click "Solved It" next to this reply

How do we fix this add on issue?

Also, I can no longer access any drop down box in any form unless I use the Down and Up Arrow. I cannot click any button in Moodle site either.

How do you do this?

• Control whether Firefox automatically fills in forms
• Firefox doesn't save web form entries
• Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

Check and tell if its working.

[Rant removed by moderator. Please read Mozilla Support rules and guidelines and remember that this forum is for helping people, thanks. If you need help and are not the person who started this thread, please use https://support.mozilla.org/en-US/questions/new where volunteers can get more details about your setup.]