HI,
Today, after updating FireFox from 3.6.9 to 3.6.10 I was NOT able to open it when Sandboxed with an XULRunner error: see attached JPG.
In fact, I tried to open a Sandboxed "Safe mode"of this new version, but to no avail, so here any add- on can be ruled-out of the equation.
When running UN-Sandboxed, this new FFx version runs perfectly fine, either in "Safe Mode" or in the Standard one.
Thanks