I tested the libmozjs185 workaround instructions in a i386 VM, so I'm 95% certain they'll work on an actual Pi. Only difference (other than that it's a VM) is that I had to use i386 packages instead of the ones in the instructions. I also had set the environment variables earlier than when the instructions say, but that shouldn't matter.
Point is, I think the instructions are working as planned, so I'm going to merge them into the table of steps.
- Andre