It doesn’t seem to support Firefox or mobile browsers, at least not.
Maps on the web is compatible with these web browsers
On your Mac or iPad
- Safari
- Edge
- Chrome
On your Windows PC
- Edge
- Chrome
If you wanna degoogle, https://www.openstreetmap.org is the way to go.
For your phone:
https://organicmaps.app (simple, easy to use)
https://osmand.net (more features)
https://www.magicearth.com (proprietary, with traffic info)