Randall E. Barker

This is unfortunately caused by WebXR not supporting MSAA at this time. In v9 the page used WebVR which did support MSAA but in v10 it is using WebXR which...

We have made some adjustments in v10 rc4 that should help improve image quality until MSAA can be enabled for WebXR immersive experiences.

This is most likely a Gecko/SpiderMonkey performance issue. Please capture a [profile](https://perf-html.io/docs/#/./guide-remote-profiling) of the issue and share the profile here: https://bugzilla.mozilla.org/show_bug.cgi?id=1498485

Thanks, I’ll make sure the right eyeballs see it.

I think we are wait for the FxA library to support this. @keianhzo Do you know what the status of this feature in FxA is?

Making this part of the build on takscluster will prevent it from bitrotting.

Not at this time.

Still blocked on Gecko.

GeckoView already has the prompt API in place. It's our responsibility to implement the UI for the prompt. It might need to be platform dependent as I'm not certain what...

This comment details what FxR needs to do to support a file picker: https://bugzilla.mozilla.org/show_bug.cgi?id=1476810#c1