Plugin guide
(Linux)

Next, select the emulator that you're using.

Using any emulator outside this list to play SM64 romhacks isn't recommended and can make you run into lots of issues, and many romhacks may not run altogether.

If you're using one, I would strongly suggest that you switch.

Update: Project64 1.6 is no longer supported due to a major vulnerability that was found within it. If you use it, please consider switching.