In Kubuntu 12.04 KDE Firefox integration is lost.

I am trying to figure out if there is a way to get it back, as it worked great in Kubuntu 11.10.

already discussed see viewtopic.php?f=66&t=101245&p=218829&hilit=kubuntu+firefox+mint#p218829

also you could try patching FireFox git http://gitorious.org/firefox-kde-opensuse

for FireFox (and maybe Thunderbird) for Debian and *buntu derived distros see http://blog.martin-graesslin.com/blog/2 ... n-testing/