the patch 2 works fine for us WITH Firefox 10.0.6 and previous version
CPU between 0 and 1 % and 11 MB ram
As soon as you install the Firefox 10.0.7 ESR, the CPU for the firesvc process jump to 25% and the browser can't be launched completely. And the Firefox process becomes unstoppable.
Returning to the 10.0.6 version let the firesvc process works correctly again.
We will investigate more