... I know it will sound very ironic, but homepage of Github.com when you're not logged in is now using Webgl for some logic. Disabling WebGL renders page not loadable with potentially infinite leak for Firefox leading to "page is not responding". I suppose when you're logged in, this weird mechanics is skipped, that's why I'm able to write this message right now.

While I understand the benefits its meant to provide, I think its counter-intuitive to enable it by default now that it will effectively deem being unable to reach the even this repository to get the solution. It wasn't even straightforward that its exactly user.js modification issue until I was able to open web inspector prior loading homepage of github.com to see all the stacks of WebGL errors that eventually lead to page freeze.