KM74 about:home when I change preferences to the https google version address the pages launched from then on or reloaded become as if zoomed down to the smallest size possible and completely unreadable. The only way to restore back is to delete prefs.js. Is anyone else getting this?

Yeah lots of people wrote it already.
You may want to take a look at the various 74/1.8 threads, but that's countless pages.
What's your default zoom setting? (F2 > Page Display)