I just downloaded the latest version of Firefox and immediately found it to be unstable; stopped responding 4 times within minutes of updating. Most of the time all I had to do was click Bookmarks and it would stop responding. Tried searching for help on here and tried a few things including clearing my cache, removing cookies and setting it clear history when it closes... etc Now Firefox is completely unusable. Sometimes it won't start at all and when it does startup it immediately stops responding altogether. I have to force it to close by ending the processes. I have tried opening FF in safe mode, resetting it, uninstalling it and going back to ver 28, restarting my laptop... nothing works. Am assuming this is because it remembers my settings each time. I don't want to lose my bookmarks and extensions etc. so don't delete them along with uninstalling FF. What can I do to fix this?