[bq="Sollace"]The browser console gets a bit spammy because of how deribooru handles external resources[/bq]
Heh, those are Content Security Policy warnings and not something we've put there because we enjoy sp
We'll put out a general warning to userscript/userstyle authors with suggested alternatives and keep that up for a while before it happens, though. I'd suggest either uploading them to the site as you said or include them as base64-encoded data within your script. If you upload them, do it with a small amount at a time to avoid flooding the frontpage. You'll also want to look at the "GM_addStyle" function for injecting CSS, since this bypasses CSP.
Besides this, it looks like a neat script.