Looks like you won't have to wait for Mozilla's streaming dongle to stream from Firefox: the browser's nightly Android test build now supports Chromecast natively. Mozilla's Lucas Rocha casually mentioned the new feature on his Google+ page and, sure enough, if you download the latest build it's there - hidden under the tools section as "mirror tab." The feature works, but it's early: in our tests the mirrored tab was more than five seconds behind the handset, and was prone to crashing. Want to try it for yourself? You can download the Android APK at the source link below.