I'm going to be another person who is the "odd man out and exposed".
I've been running Pale Moon with GTK2 on my two desktop tower computers. I like it and it doesn't give me any problems on either of those two desktops. I put Pale Moon GTK3 on my small HP dv4-5113cl laptop (14" monitor screen, 1366 x 768) with 16 GB of memory, Intel i5 processor with 2.50 speed which I use for experimental purposes. There is one glitch (which I won't go into) with GTK3 that I don't like, but that might have something to do with the hardware in this laptop.
I have two desktop tower computers and one of them originally came with a three hard drive bay and (ugh!) 64 bit Windows 8 which I immediately wiped and loaded 64 bit Windows 7 Ultimate on that hard drive. On this particular desktop tower, it has a third hard drive in it which I use for experimental purposes for different linux distros. It is a relatively fast computer (Intel i7 processor 4770) with a processor speed of (3.40) and 32 GB of memory.
When 64 bit Linux Mint 20.2 is released which is GTK3, most likely in July of 2021, I will put Pale Moon GTK3 on that hard drive and see if the glitch which I don't care for on my laptop, is still there with my 27" external monitor. If it isn't then I will start using GTK3.
But I must confess. I don't use Steve Pusser's repositories. I get my 64 bit linux Pale Moon tarballs from the link below.