Well, now everything is working AFTER i refreshed firefox and hosed all my settings practically- what a pain getting them back the way i like them-
I was able to uncheck “Allow Firefox to install and run studies”- and closed FF reopened, and it’s still unchecked and my “xpinstall.signatures.required” is still set to false- not sure why yours got rechecked?
It was true when I started. True is apparently the more-secure default setting. I reset it back to true after my extensions came back.
By the way, I just unchecked the two "Firefox Data Collection and Use" boxes, and everything is still working OK.