Maybe you've tried to get the new firefox 4 to display applets by using the good ol' libjavaplugin_oji.so with no success. It took me a while to discover that newer versions of firefox require a different plugin called libnpjp2.so which is located in a totally different place in Sun's JRE tree.
Create a symbolic link in your plugins directory (either /usr/lib/mozilla/plugins or in your home directory in $HOME/.mozilla/plugins) and your firefox 4 should be able to display applets.
ln -s /usr/java/jre1.6.0_24/lib/i386/libnpjp2.so /usr/lib/mozilla/plugins
Why did nobody tell me?
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