I have been using Comodo for 6 months with no problems. Last week it prompted me to update, which I did. Afterwards I could not open Firefox. Today I uninstalled Comodo and Firefox is running perfectly. I will use the search facility here to find an alternative user recommended firewall but can anyone tell me why this may have happened?
The first time you opened firefox after the comodo update, a window probably opened saying "Firefox is trying to whatever...what do you want to do?", maybe you inadvertantly told it to block firefox? Anytime I've updated it has to re-learn everything, which can be a bit of a pain.