where is webgl?

You can check these prefs on the about:config page

• webgl.disabled => false
• webgl.force-enabled (possibly => true
• webgl.enable-webgl2 => true
• https://support.mozilla.org/en-US/kb/about-config-editor-firefox

See also:

• https://webglreport.com/?v=1
• https://webglreport.com/?v=2

The "WebGL creation failed" error and availability of WebGL 2 indicates WebGL is not disabled.

On the same system it works in Nightly!!!!

Does it work in a new profile? Alternatively you could refresh your existing profile. Make sure you stay signed out of your sync account when testing.

No New profile looks the same, There is error in firefox code. I started the same subject some time ago but did not follow up the same advices as yours. All instructions checked / fail.

Does it work on Developer Edition?

Does it work on Developer Edition?

Never used developer editioon, Why shall I?

plenty of config for webgl but all look a bit ununderstandable

Those locked settings are not normal.

Try installing Firefox from the Microsoft Store.