Any chance you could make it so adding the search to vanilla FF57 only adds the specific board you are on instead of every board aka opensearch?
Like, if I am on https://desuarchive.org/co/
and add the searchengine to FF, I only get /co/ and not the whole site.
If you need an incentive, I imagine this would save some bandwidth.
I have no idea how exactly this shit works, but I could do this with an extension pre57, but obviously that's not an option anymore.
The extension was Add To Search Bar (2.5.7 iirc).