Klaus Steinberger writes: : this bug is hitting me since at least firefox Version 1.5.0.6 (i think : 1.5.0.5 introduced the bug). Also the new 1.5.0.7 Version has this bug. : : Every time the acroread Plugin is called firefox crashes. Also there : is an additional bug (or probably the same bug in another look and : feel). The SUN Java Plugin starts, but does just nothing. Could be : easily reproduced by surfing onto the SUN Java Testpage : (http://www.java.com/en/download/help/testvm.xml) Regarding the Sun Java Plugin, I installed it just yesterday on my up-to-date FC5 system running Mozilla-1.7.13. When I go to the Testpage above, it says the plugin is installed but "the dancing Duke logo" doesn't render at all. I see just a white area. So I'm not sure this problem is related to your acroread problem. Regarding acroread, I had a problem getting acroread to run in mozilla. It turned out to be due to a conflict (that I still don't understand) between mozplugger and the nppdf.so plugin library from Adobe. Do you have mozplugger installed?