I have Ver. 3 and tried to update FF to 2.0.0.12. It locked up my computer. I booted to my secondary snapshot[FDISR] . Then I updated my primary from the secondary and tried again. Locked it again. I finally exited Comodo then it downloaded.
I had no issues downloading Firefox 2.0.0.12 at all using Comodo. Are you using a download manager or Flashgot plugin for Firefox? Firefox is on the whitelist so its a trusted program. Make sure Firefox is trusted in the firewall settings and D+ settings. Where did you download the update from? I downloaded it from Majorgeeks.com with no trouble.
I think that I may know the problem. I have SSM Pro. on my machine. I know that I'm not supposed to . That is why I am running the Firewall with Leak protection. I have a lifetime license for SSM and at this time would rather keep it. But I love Comodo and other than this one problem,there hasn't been any other issues. I will just have to remember to exit one or the other before installing something.
Comodo 3 with leak protection is still a fairly comprehensive HIPS. It might be better to run D+ in its full force and drop SSM.
True Diver. No need for SSM when you have Comodo. Thats like running 2 firewalls. It may be conflicting.