Why does it not load tiles on Firefox nor Librewolf?
OpenStreetMap community
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https://learnosm.org/en/ has a lot of information for beginners too.
Sounds like you've disabled webgl
No, definitively not it. It shows the sphere and even some city names, but just no background map:
It rather is that Mapbox doesn't trus my browser and gives me a "forbidden":
Guess firefox isn't corporate enough for them!
OSM Contributors Copyright is not credited correctly:
Provide credit to OpenStreetMap by displaying our attribution notice.
Make clear that the data is available under the Open Database License.