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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?

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Please post the error-related output you see in the system Console. – jtbandes Sep 19 '09 at 20:22
Which version of OS X and Firefox are you running? – ayaz Apr 2 '10 at 9:42
No feedback from author in 2 years... – LatinSuD Sep 24 '11 at 22:52

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:

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There is no jar file in my ~/Library/Java/Extensions but i still delete that but i have same issue. – itsaboutcode Sep 19 '09 at 21:06
update java to the latest versions. then clear cashe (and if you have to back up bookmarks and create a new profile, or even reinstall wiping the old profile) – alpha1 Sep 19 '09 at 22:22

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