I have not updated Firefox for some time, and do not know which version I was using. I use a Macbook and today I upgraded to OS X Mavericks. However, it updated my Firefox and now I have version 26.0. The scrollbar to the right has disappeared. To get it, I need to press my down arrow key and then quickly get the arrow onto the newly appeared black bar, in order to scroll. There is no arrows available either and I cannot find out how to add them and the scrollbar back in. I don't like the apple style scrollbars that hide when you don't use them, which is one reason I didn't update for over a year. I just want a visible scrollbar back and visible arrows I can click on. Any ideas? I have no knowledge of computer code so am hoping there is a way to do it without having to go into a shop to get someone to edit code for me.