I've been experiencing this problem since Firefox 18 and now that I have Firefox 20, it's still happening. I've done all the recommended things on the forum and checked around the net for possible fixes, nothings worked.
I've done the create new profile, malware check, check add-on's for updates and updated them to the latest updates, enabled/disabled add-on's/themes, etc. Nothings worked. Is there anyone out there with a fix? Not the stuff I have already mentioned or other stuff that's on the forum or already asked questions, those don't work. If not, I guess it'll be time to switch to chrome or something, cause this is a pain and to be frank, it just isn't worth that stress. I've had Firefox since Firefox 1, it'll be a shame to have to switch, but if no one knows how to fix it, then I will.
Sorry about those issues you're having with Firefox! It does look like you've tried all troubleshooting steps, so my suggestion here is to give Firefox Reset a try: Refresh Firefox - reset add-ons and settings . It will restore a lot of the Firefox settings to factory defaults while attempting to keep your personal settings like bookmarks, passwords, etc.
Give this a try and see if that takes care of it. Good luck!
Do you keep a large history?
Did Safe Mode had any effect?
You can check for problems with the sessionstore.js and sessionstore.bak files in the Firefox Profile Folder that store session data.
Delete the sessionstore.js file and possible sessionstore-##.js files with a number and sessionstore.bak in the Firefox Profile Folder.
Deleting sessionstore.js will cause App Tabs and Tab Groups and open and closed (undo) tabs to get lost, so you will have to create them again (make a note or bookmark them).
This is crazy I've been using firefox as my default browser since it was first released, but the thing has become useless to me now cause it freezes up right when I'm in the middle of something & need it not to.
I've deleted history, dispensed with add-ons, reset the thing to b.....y & it still happens. Quite frankly I'm disappointed with the way mozilla tries to blame the victim by making us jump thru alla these hoops when blind freddy can see the fault lies with them and the changes they introduced on some alleged 'upgrade'. What gets me most is that mozilla won't revert to the v17 iteration that worked fine without freezing or ever locking up. Surely they know what they did to screw the pooch.
Try disabling graphics hardware acceleration. Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.
You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).
Then perform these steps:
Additionally, please check for updates for your graphics driver by following the steps mentioned in the following Knowledge base articles:
Did this fix your problems? Please report back to us!
Yeah, I tried, but no success.
On a side note, some friends of mine are having the same problem as me. We've all be Firefox users for years, and this problem hit us roughly the same time. Most of them have moved to Chrome now, because we couldn't figure out a solution, and it seems that updating Firefox keeps making it worse. Clean installs seem to work for a few days to a month, but it'll go back to freezing and lagging after that period of time, even if you delete every Mozilla file on the laptop or pc.
The hardware acceleration has been tried as well, it doesn't do the trick.
This isn't a setting or computer thing. As I've stated before, this is a Mozilla software problem. It wouldn't keep recurring after a clean reinstall if it wasn't. It started with Version 17-18 and it persists to the most recent of updates.
I actually had an old computer I built back in 2006, I plugged it in and fired it up after a few years of retirement, it had Firefox version 3 on it, I tried it out for a few days just like I'm using the the current version to see if it was just the tabs and the way I was using Firefox was causing the problem, after over a week, no problem at all, it works just fine, I'll keep using it to see if something happens and report back after a month.