Greasy Fork is available in English.
Adds fields for persistent global & fandom filters to works index pages on AO3
< Feedback on ao3 saved filters
This script just saves your filters, so if you add more than what AO3 supports, you'll get the same 502 error.
There is only one box to add global filters, but you can fill it up with however many terms AO3 supports.
questions
Is there a limit to the filters?
I ask because I had reached a limit in AO3 regular filter thing and kept getting error 502 only removing filters would I start getting regular non error site.
Multiple saved global? So far I only see a single Global thing and no idea if it will save others.