As soon as I call
new BABYLON.PhotoDome
I get a
WebGL warning: uniformBlockBinding: blockIndex (4294967295) must be less than ACTIVE_UNIFORM_BLOCKS (2). engine.uniformBuffer.ts:140:13
You may reproduce it in
https://www.babylonjs-playground.com/#1NB0Z9#0
macOS, Firefox but not Chrome!
BORDBOOK ADDENDUM:
Firefox Developer Edition 78.0b2 (64Bit)
The odd value 4294967295 is 0xFFFFFFFF or -1
It is retuned by this._gl.getUniformBlockIndex(program, blockName);
So it’s the implementation of gl in mac Firefox Developer Edition 78.0b1 (64Bit) ?
Chrome is ok: Version 83.0.4103.97 (Official Build) (64-bit)
Looks like I have to teleport this issue to Firefox :-/
I will tell you …
Got response from Morzilla (see link abow)
Interesting, sounds complicated, does not solve the warning I get
and I do not have any clue what they are talking about, you?. 
I don’t understand the answer, it seems related to something else (Sponza is a 3D scene used in a Babylon demo).
Did you try webgl.disable-angle = false? I think you would need to close and restart Firefox after this change.
I tested webgl.disable-angle = false and now true also, restarted Firefox-Developer, even installed the “normal” Firefox: No better 
So the simple backgroundPhotoDome Playground does not use Sponza? Puzzeling!
Firefox seems to be a bit odd. I also see a lot of CSS-Errors with all Playgrounds in Firefox only:
Error in parsing value for ‘width’. Declaration dropped. [www.babylonjs-playground.com:1:34966]
Elements matching selector: #animation-curve-editor .content .graph-chart .playhead
I will check with Chrome next time before I blame BJS again.
Morzilla put this topic to low, but there still is hope.
