I use Firefox on Android as my main driver (former Mozilla eng) and I haven't had a crash, but have noticed sometimes videos don't load. On Chrome too sometimes, but usually the issue is with the lazy loading of images (Firefox lazy loading TBD https://bugzil.la/1542784).
I've been avoiding adding any JS, but interaction observers may be necessary since I haven't been happy with how any browsers handle 5 or so muted webm videos.
Chromium-WebAR is a similar project, but backed by Tango, and currently exposing a different experimental Web API than WebARonARCore and WebARonARKit. Soon we hope to update Chromium-WebAR (with a rename to WebARonTango) to have API parity with the ARCore/ARKit-backed browsers
[member on the devtools team]
A strategy and implementation for source maps across all tools is something we're actively working on. It's frustrating for us as well when working on side projects, if that is any indication of how much we'd like to get source maps everywhere
in Aurora (Fx39), profile/time tools create profiles and marks on the timeline, but nightly (Fx40) has a combined tool and the profile/profileEnd commands landing soon
watch/unwatch are from Object.prototype, confusingly enough!
time/timeEnd, profile/profileEnd all work in Firefox up to Aurora -- current nightly has a new performance tool that will support profile/profileEnd in a few days, and will most definitely have it before uplift to Aurora https://bugzil.la/1077464
I've been avoiding adding any JS, but interaction observers may be necessary since I haven't been happy with how any browsers handle 5 or so muted webm videos.