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Apple Maps on Web Now Supports Firefox Browser
(www.macrumors.com)
A place to discuss the news and latest developments on the open-source browser Firefox
Huh? OSM is not a maps app. And this is completely unrelated to browser and OS support. OSM is a maps repository.
You can browse the maps of the "repository" via openstreetmap.org in your browser. There are multiple apps using the "repository", like Gnome Maps for Linux or OsmAnd on Android.... And many other apps: https://wiki.openstreetmap.org/wiki/Software/Desktop
What exactly is the problem?