Kalalokki
Sprite Leader
There's Stylus available now, basically an open source fork of Stylish without all the nasty data collection. Going to userstyles will prompt it to install to Stylus as well so no need to migrate as of now.Thanks Kala, noted.
Also, it would appear that Chrome/Firefox is pulling support for Stylish for a breach in their Terms of Use (data collection. Don't have a link, but pretty easy to Google). In the meantime I'll try to find another solution. I've read of a different extension called Stylus which will perform a similar role, so perhaps that could be a workable alternative. Afraid I'm not in a position to determine the solution atm, but hopefully will have something in the next few weeks.
Sorry for any inconvenience!
Edit: Oops, ty Blueforce for the heads up