"Enable Right Click & Copy" has been working very well for me for at least 3 years - probably 4. It is now Feb. 28, 2023 & I'm using latest Firefox 110.0.1, on Windows 10 (still on Windows 21H1 on one computer and 22H2 on another). I very rarely find a site where it doesn't work. I avoid Spygle except on the tiny number of occassions when I can't, and haven't tried it on any Spygle sites as I don't need to use it in "gmail" or "Drive" to copy & paste - I just tried them again to be sure.