Yes, this is true. Firefox is not supported, mainly because of technical difficulties. FireFox (just like Opera) would be very difficult to "hack"...

BTW about the differences between home and pro, it's definitely not only the scheduled scans. First, the PUSH updates. Then, the Enhanced User Interface -- this is much more important than you may realize because it lets you do many things that are inaccessible via the Simple UI, such as setting of automatic actions for the on-access scanners (mail shields etc), customization of archive scanning (both on-access and on-demand), and fine-tuning all scanning parameters. Also, please keep in mind that the Home version is for home, non-commercial use only - meaning that in all other cases, avast Pro is the only alternative (if you opt to use avast, of couse..

Thanks
Vlk