I believe google has intentionally made google maps near unusable in firefox. It's been consistently working worse and worse every year. I feel like about 8 years ago there used to be parity between them.
I think this example is weirdly informative to me.
I mostly use maps via an app (Apple or Google, they seem to be the same for basic use). Usually if I’m using a map, I’ll be using it in my car for navigation, so Firefox doesn’t even come to mind.
I suspect, on top of the “maybe it is internal apps” thing I mentioned at first, some of the really bad sites are the really interactive ones, I probably just use the app without even thinking of it.
I am using it regularly without issues on firefox so I am not sure what you are talking about and definitely not in the "unusable realm". Can you be more specific?
Its really bad, it takes almost a minute for the site to "stabilize", and even then, default text in the search bar is overlaid with whatever you're typing, a good 30 seconds to load a destination.
A chrome browser on the same device has maps behave almost instantaneously.