Barefoot_Monkey: I rolled back GreaseMonkey myself last night, because virtually nothing works on it yet. The dev decided to make changes in GreaseMonkey 4 that are
not backward-compatible, but did provide a nice polyfill that I should be able to use to get it up and running again without breaking support for Tampermonkey/ViolentMonkey/Scriptish in the process. If all goes well there should be an update soon. (In case you're wondering how I'll test on version 4.1 after rolling back to 3.17, I have a GreaseMonkey 4.1 running on Portable Firefox).
So yes, there is not any possibility to turn out auto updates on Greasemonkey but you will try to rebuild BE so that it is still working with the new version?