Ever since I installed Firefox 4, I have noticed a problem that was not present with the previous version of Firefox. Whenever I open up Firefox and enter in a new web address, I cannot use the back arrow to go back to my original homepage; the arrow is ghosted out. The same problem exists when I open up a new browsing tab. Let me explain with an example. I open up my browser, and then I open a new tab (now there are two tabs open). In the new tab I type www.espn.com. Then I click on a link on espn.com. Say then I want to go back to the espn.com homepage that I just previously visited. I can't do it by clicking the back arrow; it's ghosted out. I have to physically type the address again (www.espn.com). Why has this changed? Is there a way to fix it? Why can't I just click the back arrow to go back to the espn.com homepage that I typed in originally (or my original homepage if I opened up a new window instead of a tab)? Oddly enough, if I go one link deeper into the espn.com site, I can then go back to the immediately preceding webpage, but not all the way back to the original espn.com homepage. I can't stand IE, but it doesn't have this problem. This problem also was not present on the old version of Firefox. I just verified this by testing the old version which I have installed on another computer. Please advise.