HTML5/WebGL: Game Not loading or frequent crashes

[Deva_CED]

The error I am getting on the black screen, without the square spinning, is
An embedded page at l1.slashkey.com says
your browser does not support graphics API "WebGL.2" which is required for this content

I had previously been able to resume playing by closing the browser, restarting my PC and restarting my browser.
Unfortunately, this has not helped this afternoon.

My user id is 1482794697

Thanks.
Celeste