I reinstalled GData a few minutes ago and this time I opened Fx with just one tab and the GData popup request to install a banking extension did not cause Fx to freeze.
However, I encountered another SERIOUS problem. It was likely there the first time I installed GData but Fx freezing kept me from noticing it as I uninstalled it right away after that freeze.
With GData installed, I could not access HostsMan! And ALL HOST ENTRIES WERE PURGED!
When I tried to open HostsMan, I got a popup saying "Access Denied" and Hostsman looked blank (the entire program as well as there being no entries)). I couldn't even close HostsMan where it opens on the Desktop after booting.
I have contacted GData support. I am wondering if GData does something like Windows Defender and maybe I have to exclude Hostsman from the scanners? I won't surf without my Hostsfile entries as I have zero interest in having Facebook and Twitter tracking me or Google analytics, etc. So, I uninstalled GData again.