I upgraded to firefox 4.0.1 at home on my desktop and at work on my laptop. At home I use windows xp and at work windows 7. I like having my bookmarks on the sidebar to the left of the screen and at home on xp that is not a problem. At work I can find no "view" button nor any other drop down menu that will let me set the sidebar with my bookmarks. I honestly can't find anything about setting any sidebar either. I went to the help section and typed in sidebar and bookmarks and got something about "delicious" something or other which didn't help me at all.