hyperfekt
Safari support
The Stylus extension does not support the Safari browser since the latter is not compatible with the WebExtensions API.
The aim is to work around that by providing a way to manually compile the userstyle with custom values.
It appears Stylish does not support installing from URLs instead of a userstyles.org page, which means there cannot be a one-click install link.
Additionally, pasting in moz-document style seems to be broken.
All in all, Stylish has become a terrible extension that will never be first-class for this style.
For now I recommend loading https://raw.githubusercontent.com/hyperfekt/master/search/search.user.css in http://beautifytools.com/stylus-compiler.php, uncommenting the variables, adapting them to your need, compiling the whole thing, creating a new style in Stylish, manually splitting up the different moz-document parts into different boxes and adding the regex rules for them. Repeat this every time you want to update (or use a browser that conforms to modern standards).
Just a thought?
Is there no way to use something greasemonkey or tampermonkey in safari and adding ANY style as a userscript or something?
Hmm, it could be possible if you basically ported Stylus (the extension)
into a Userscript. I'm not sure there's anyone who wants to undertake such
an endeavor.
It might be easier to add Stylus (the language) support to a userstyle
extension that is available on Safari or port Stylus (the extension) to
Safari.
I don't think the problem is technical feasibility, it's more someone wanting to invest the time to make it happen.
The applying a style itself doesn't appear to be too big a task compared with parsing options, offering to change them, compiling the whole thing and then parsing the sites it applies to.