Stylish 3.1.2 and greater - Add-on Support - Mozilla Discourse

Chrome and Firefox Pull Stylish Add-On After Report It Logged Browser History

Stylish Alternatives for Firefox

Stylish appears to have been removed from the Google Chrome store : r/ firefox

Another Dimension

Stylish for Mac - Download

Stylish is back, and you still shouldn't use it

Firefox Add-ons Manager

Firefox – View from the Potting Shed

Yet another Dark Admin theme - Stylish Code - Customizing Pi-hole - Pi-hole Userspace

Firebug Tip: Alternative Firebug Themes