Firefox audio developer here, would you mind giving me a link to a couple of those "spatial audio tools" that don't work in Firefox?
The only one I have bookmarked is https://getmibo.com, which claims to "currently only work in Google Chrome"
I understand Safari because it's just a massive pain to develop for because you need custom hardware (and because it lags behind in implementing open standards), but Firefox is perfectly fine for any decent JS application, even if its JS engine is a bit slower. User agent filtering is a thing of the past, web developers need to fix their shitty apps instead of forcing Chrome down everyone's throats.