Just wanted to pop in here and say that it looks like the character builder works great in OperaGx with no issues so far. As new features come out, this will be the primary browser I intend to use for Nexus despite everyone loving Chrome and Firefox. That being said, I’m not sure if this is a happy accident or if the developers took OperaGx into consideration when developing the site.
We’ve tried to make it work in as many browsers as possible, so supporting Opera GX is definitely intended. Firefox handles enough things differently that it’s not supported at the moment, but we hope to address that later on.