[openstreetmap/openstreetmap-website] Standard layer tiles not shown in Firefox - tile.openstreetmap.org gives HTTP 418 "I'm a teapot" (Issue #4213)

[Wolfram]

### URL

https://www.openstreetmap.org

### How to reproduce the issue?

- When opening https://www.openstreetmap.org using the standard layer, the tiles are not shown (all grey)
- This only occurs in Firefox (currently 117.0 (64-Bit)) since a couple of days, works fine in e.g. Edge on same PC/network
- Occurs also in Firefox safe mode without any extensions active
- Looking into the console it shows HTTP 418 responses from tile.openstreetmap.org
- Opening a tile URL directly shows the tile (e.g. https://tile.openstreetmap.org/14/8616/5706.png) correctly

I am sorry if this is not the correct place to raise this issue, but I could not find another suitable place during my search.

Thanks and best regards!
Wolfram

### Screenshot(s) or anything else?

![grafik](https://github.com/openstreetmap/openstreetmap-website/assets/57175644/bf111bbc-9214-49f2-a360-d7f90df18933)

![grafik](https://github.com/openstreetmap/openstreetmap-website/assets/57175644/30fa641a-36b4-47a7-a569-e842dd533b86)





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