About two weeks ago I carelessly installed Firefox 3.6 on my Kubuntu 9.10 System (forgot to turn off the mozilla repository before doing a full-upgrade). When I finally realized what had just happened, Firefox 3.6 was already up and running and I figured I might as well give it a try. All in all it works quite well and I have not had a lot of trouble with it.
Today I realized that java applets dont work (If I needed further prove for the fact that java has become completely irrelevant for websites this is probably it). Luckily the solution is relatively simple:
cd /usr/lib/firefox-3.6.2pre/plugins sudo ln -s /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/amd64/libnpjp2.so
Then restart Firefox and check that java is listed in about:plugins .
Now I am again able to use the ONE java applet that I am forced to use on a regular basis. Hooray!