My operating system is OS X. If a page which has a Java applet in it, Firefox crashes. Safari is works great without any problem on those pages.
What would cause this problem, and how can fix it?
Seems a bit obvious, but have you tried deleting the ffox cache, updating java and creating a new ffox profile? Google results for firefox java crash seem to point towards the new profile being a possible fix.
Also try deleting the files in jars in ~/Library/Java/Extensions, as suggested here: http://support.mozilla.com/tiki-view%5Fforum%5Fthread.php?locale=ga-IE&comments%5FparentId=385394&forumId=1