11.04 64bit and there is a problem with Firefox. Firefox doesn't display texts in websites for example in www.yahoo.com it doesn't show any text (for example there is mail Javabutton but it doesn't have text on it!) and when i click on Javabuttons nothing happen!! even it doesn't show news texts on this site. and there is same problem in other sites. i removed Firefox completely and install it again but it didn't fix. please help me!