Very limited selection of themes as the website is broken.
...the hello kitty youtube theme looked okay, but I wanted one with mroe pink, so I tried to search. It said "bad gateway". I will not return.

If You Use This Uninstall This Malicious Extension If You Want An Alternative Use Stylus

Ne fonctionne pas du tout et en plus quand on accède au site de l'extension le message bad gateway 502 s'affiche.

the extension steals or your browsing data.

Consider uninstalling the malicious Stylish extension. In 2016, with no input from the userbase, through some guy, pretending to be an independent developer, it basically was sold to a shady web analytics company, Similarweb. Since then, it is actively sharing your entire non-anonymized browsing history demo with them, assuming you ever clicked on one of the flashy "Agree" buttons. It initially did this without even asking for consent, and was banned from extension stores afterwards. Currently, it still breaks store policies, yet is not banned for unknown reasons. A safe alternative is Stylus.

Spyware

doesn't work

unofficial, prob spyware

This extension is a complete hoax. The homepage userstyles.org is not accessible with the Firefox browser. On all Chrome-based sites, userstyles.org is accessible without any problems. It's a shame how Firefox users are being fooled here.

Dead?

not working website

Dead addon better deleted from from Firefox

this is no longer the extension for this addon it is not called stylus for firefox cause i tried installing a them from stylish main page and it installed to that extension on my firefox browser so i reccomend picking that extension up if you wanna continue using it this is the link for that extension https://addons.mozilla.org/en-US/firefox/addon/styl-us/?utm_source=addons.mozilla.org&utm_medium=referral&utm_content=search

Lo siento, pero esta utilidad no funciona. No hay manera de activar los estilos. Tampoco se pueden editar.
¿Qué habéis hecho? ¿Cómo es posible que un desarrollo como el que habéis tenido que hacer para crear esta herramienta, haya dejado de funcionar? Creo que es una falta de respeto porque, ahora, tendremos que perder el tiempo buscando otra utilidad.
¡Qué vergüenza! En mi grupo, dedicamos más del 30% a pruebas de software y a detectar regresiones.

Zero stars because for many years I have supported the product and recommended it to whomever asked for web-page tailoring. To my surprise, I have found today (a new installation) that I cannot import the exported styles. I cannot create a new one because no edit box appears. With the new release, the product was of no use. This reminds me of Microsoft's attitude breaking old stuff.
I have supported the tool for many years. Stylish, along with Greasemonkey, were my main recommendations for tailoring web pages.
The exact day when I see I can import and edit scripts, I'll come back to the 5 starts. Now I have to find a different set of tools.

Spyware, privacy policy doesn't load, asks for permissions to track every URL you visit.