In accessibility on mobile, theres an option to enable "Zoom an all web sites" even if the sites don't support zooming. It's a brilliant feature.
However, there's a couple sites where this zooming feature causes the site to be borderline unusable. A commonly used example would be DuckDuckGo's search in the "Image" results tab, where zooming in/out in a selected image glitches between DDG's own zooming feature and Firefox's zooming feature.
Being able to add exceptions for sites where Firefox's zooming accessibility setting is *not* applied would be very useful, like how other settings have site exceptions.