Welcome to Firefox for Android Add-ons.
Add extra features and styles to make Firefox for Android your own.
CloseDeveloper reply by ChoGGi
Rated 5 out of 5 stars
Great addon, but not compatible with ff 57 :(
upd: sadly, stylus can't use external editors pretty much like every other addon exept stylish-custom.
:(
You're going to have to stick with Stylus, or use Palemoon.
To create your own collections, you must have a Mozilla Add-ons account.