You claim it's dead, but suggest using a fork that can't hope to keep up if Firefox dies? They benefit from all the architectural improvements done to Firefox, including this.
What size is a memory page on other ARM CPUs? I think Apple's processors use 16KiB pages. Doesn't x86 software assume a 4KiB page size, unless it deals with huge pages?
This project is nowhere near the level of Wine, if that's what you're expecting. They admit they have basic experimental support for simple GUIs. Anything command-line is highly likely on Linux anyway.