Pre-requisites: Have some earplugs plugged in. Have a passcode on the lockscreen STR 1. Play some music 2. Lock the device 3. Try to unlock it to show the passcode keypad 4. Go to the emergency dialer 5. Press some keys on the keypad Expected results Like for the regular dialer keypad, you should hear the tone over the music. Actual result The music goes soft for about a second, you barely hear the tone and then the music is back to normal again.

I've just tried this on my Flame with a master build and I cannot reproduce it, neither with earplugs or without.

I checked again against a master build[1] and I can reproduce the issue. I used the Music app with mid-volume (repro'd with full and low volume too) and with or without earplugs. [1] Gaia-Rev 0e429d970c160e580e19e61ad8ff5612de159f00 Gecko-Rev https://hg.mozilla.org/mozilla-central/rev/035a951fc24a Build-ID 20141207160206 Version 37.0a1 Device-Name flame FW-Release 4.4.2 FW-Incremental 39 FW-Date Thu Oct 16 18:19:14 CST 2014 Bootloader L1TC00011880

Thanks for having tested again, this is really bizarre. I'll have to double-check.

Firefox OS is not being worked on