Hi Jim. I use Comodo Dragon mostly which is the Chromium variant. Ice Dragon is the FF one...got that too The Dragon has one or two more security features like Block Referrer Header (in Advanced Settings) and the Privalert extension, when it's there! Dragon's been going longer so Ice Dragon may get the same stuff eventually.
It's worth looking at the Comodo Program Manager as well as a security measure because if you run any malware-infected program that you unwittingly initiate it will warn you and stop it...not tested this part myself though with some malware yet. It monitors any program installation (including 64bit) and basically does the same job as Revo for all those programs it has monitored the installation of, as it does a post-uninstallation check for any leftover entries. Been using it a month with no problems. Only using Revo on those programs it hasn't monitored the install of...32bit anyway.