Yesterday I changed from FireFox 14 to Firefox 15. However, when I went to close my browser, ALL my tabs that I had open did not open again. You see, up until 15, Firefox had this neat little feature where it would automatically restore your tabs if you clicked out of it. There has been an edit-<br /> EDITEDITEDIT: It seems that I have fixed the problem of restoring tabs- the tabs restore properly now. However, there is STILL a problem.<br /> The problem? Whenever I change the amount of tabs (either adding or subtracting tabs) I have, if I click out of the browser, then attempt to get back on again, it shows a message, which I will link to at the end of the post. It is only Firefox 15 that seems to be doing this (as 14 only did it at certain times. With 15, it does it every time if the tab number was changed before closing out). So why is it happening, and how can I stop it from happening? Here is the message it shows: http://oi47.tinypic.com/2i97a79.jpg