Greasy Fork is available in English.
Automatically shows files on Nyaa Torrents.
It should work now. I didn't have Firefox 37 installed so I just assumed it would work but apparently did some things in an order that FF37 errors on but FF38 ignores.
It's working for me. Thanks the script!
Script not working
Also, the script is said to be compatible with Firefox 38, while the current stable version is only 37.1