I think there are a few themes made by users here. I am using this dark theme.
There used to be a thread that linked all the SG add-ons/ user scripts, but it was deleted. You can view an archive of it from 2019, but it is probably really outdated and I don't know how many of the scripts still work or how many new ones there are that aren't listed there. I'm not sure if anyone created a new page that lists all the scrips.
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@kilerfusion you can also use them with greasemonkey etc.
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https://addons.mozilla.org/en-US/firefox/addon/styl-us/ there is a add-on for your browser called stylus you can find different premade styles by installing and clicking find styles, mine is blue right now i thought this was neat and wanted to share
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