I used to use ZSNES way back in the day on an old Pentium 133 MHZ I think it was. I tried it in Linux Mint, but it would lock up after a while. I bought FF6 (FF3 US) full price the day it came out and still go back to it and a few others once in a while. SNES9X was a bit buggy years ago, but it works the best for me now. Somewhere I found a 'snes9x-gtk_1.52-1_amd64.deb' file and that works great for me in Linux.