I have kept a toolbar with various addon buttons and multi-engine search bar without issue until the most recent upgrade to 4.0. now every time firefox is started or restarted, this toolbar disappears. I go to the view menu and the toolbar is no longer listed to select to view. I recreate the toolbar and the next time firefox starts or restarts, the toolbar is gone again and missing from the view menu again. This is not the only problem I am having though. Every time firefox starts or restarts, I get one or more facebook pages that open to a "liked" content page, even though those tabs were previously closed. Also, the last tab to the right always displays odd pixels just underneath the tab before the content window begins. If I move away from the tab, the out-of-place pixels disappear and do not show up again until the next time firefox is started or restarted. One final note: ever since firefox has upgraded to 4.0, the memory does not sit within a specific range; it keeps escalating until I realize it is way over 1,000,000 and still climbing and firefox is running slower and slower, at which point I am forced to restart firefox so that the memory will (temporarily) cease to be so high. Of course as soon as I do this, I have to deal with the above-listed problems all over again. I have tried downloading firefox and installing it again and it did not help. I have looked on the site for any help and cannot find any answers. I really need some help with these issues.