The Kubuntu Team has brought back the packages for Firefox 14.0.1 with added KDE-Support on Launchpad again.
The goal is to make the KDE supported version available shortly after each new official FF release.
You can find the latest packages here:
https://launchpad.net/~blue-shell/+archive/firefox-kde
To install the packages, use the following commands:
sudo apt-add-repository ppa:blue-shell/firefox-kde
sudo apt-get update
sudo apt-get install firefox firefox-kde-support