skeletonbow: Yeah, I got it uninstalled on that browser for now, but it works on Firefox 52 ESR on Linux without any problems so far. Any idea what might cause it to hang the browser between 2.18.1 and 2.18.2?
Barefoot_Monkey: I don't know, but I have some ideas for experiments to find out. You say you removed it successfully on your Windows 7 Firefox? Does that mean you can enable GreaseMonkey again without the browser hanging? And, to clarify, earlier your browser was hanging whenever you had GreaseMonkey enabled ever since BE updated, even if there was no GOG page open in the browser - right?
If GreaseMonkey works for you again then maybe try heading over
here and installing BE again to see if the same thing happens as last time. If it does then at least you know how to remove it again. But if it works fine this time I have a suspicion about what might have gone wrong.
With Firefox 53.x on Windows 7 Barefoot 2.18.1 worked, but when I upgraded to 2.18.2 I encountered 2 problems. One is that Barefoot Essentials no longer showed up in the GOG navigation bar anymore anywhere on the GOG site (homepage, forums, etc.), and the second is that opening up Tools->Addons completely hung the browser with a spinning mouse "doing something", requiring me to kill the browser, and reopening it reloaded that page causing it to repeatedly be unusable. I restarted Firefox in safe mode and disabled Greasemonkey, then restarted Firefox and all the pages reloaded including the Addons tab. I re-enabled Greasemonkey in the addons tab which requires a restart to take effect, then I closed the Addons tab as that is what hung the browser. Then I restarted and the browser starts ok and I come to GOG and Barefoot is installed and enabled in Greasemonkey but it does not show up in the navbar menu as before. I can click on Greasemonkey to disable Barefoot.
I do not have this problem at all with Firefox ESR 52.x current release in Linux, Barefoot both works and it shows up in the menu. Incidentally I'm having the same problem with Adalia not showing up in the navbar in Windows with FF 53, but not in Linux with ESR 52 (the menu problem). Adalia's presence does not cause the hang when trying to open up the Addons pane though. Also just for troubleshooting I disabled Adalia so I could test Barefoot by itself and got the same results as described above.
I saw that 2.19.x was released today and installed it from greasyfork but had the same problem as 2.18.2. Testing it in Linux on FF 52 ESR... ... ... and it works. I like the new navbar changes you made, looks sharp with the old original green and yellow GOG logo, and with the Connect/Downloader links in About etc.
Any idea what might cause the hangs when Barefoot 2.18.2 and newer are loaded when opening the Tools->Addons screen? Seems like a strange glitch to say the least, whether it is in Barefoot, Greasemonkey or even something else. :)