Over the past 5 years of having Firefox BETA on one PC and Firefox Release version on another, there's very little difference between the two. Firefox does incremental weekly updates/enhancements, so there really no "shock" to the user or to our computers/O.S..
In fact, a high-security U.S. Government website that I use for official tasks has printed across the top. "Do Not Use Microsoft Browsers. They will not work properly with our encryption. Instead, use Firefox, or Chrome." I used Firefox Beta 41 today and it worked like a charm deep inside the portal.gov system. Tried Edge for the heck of it, but it became dysfunctional, just 5 minutes into the session.