With hardware DEP (Data Execution Prevension) the MS ATI library in msvrct71.dll will crash FF3 with DEP exception on Vista. We use this library to show download progress dialog in kernel and deployment toolkit.
The work around for 6719240 addresses this problem in kernel when used in the new plugin, by not showing additional components dialog in the small VM embedded in the browser process for the new plugin.
We need the similar work around in DT (Deployment Roolkit) since this also runs in the browser process, and will crash machines that support hardware DEP on Vista.
There is no problem on IE or on Windows XP.