The Map does not render in Firefox

[svastian99]

I am using Firefox 71 on Windows 10. The orbits are rendered properly but the map is not shown, just a black background >> https://i.postimg.cc/4ycF7D4x/0.png

WebGL reports W10
https://i.postimg.cc/2rQ1sXS3/webgl1.png
https://i.postimg.cc/KxSKsyFd/webg2.png

Reviewing with Firefox 71 on Linux Mint there seems to be no problem.
WebGL reports Mint 19.3:
https://i.ibb.co/JzBs45d/webgl1-f.png
https://i.ibb.co/Dz962G9/webgl2.png