- with Mac OS X 10.9 in 32-bit mode: Reproducible with the latest Beta - 25 beta 1 - build ID: 20130917123208 Not reproducible with the latest Aurora - build ID: 20130918004001 Not reproducible with the latest Nightly - build ID: 20130918030202 STR 1. Open Firefox 25 beta 1 in 32-bit mode and load http://webaudiodemos.appspot.com/input/index.html in a tab 2. When prompted to share your microphone, click on the "Share selected device" button 3. Start exploring: choose a checkbox to check, choose an effect, etc. Actual results: after making only one action of the ones described at step 3, Firefox hangs, and it doesn't recover (force quit is the only solution) Expected results: all actions described at step 3 should be performed without any issues

I don't see this bug on Linux. Is it Mac-only? Can you get a stack trace from a debug build?

I wasn't able to reproduce this issue on Ubuntu 12.10 32bit. I didn't find any documentation on how to get a stack trace from a debug build on Mac OS X, only on Win: https://developer.mozilla.org/en-US/docs/How_to_get_a_stacktrace_with_WinDbg Since this isn't a crash, but only a freeze, I got a very useful idea from Yoric: to Sample a Process via The Activity Monitor. So, I've followed the STR again, on a clean profile, with Mac OS X 10.8.4 in 32-bit mode, and after Firefox hanged, I've obtained the file attached to this comment.

Is this only happening on Mac OSX when you force Firefox to use 32-bit mode?

(In reply to Anthony Hughes, Mozilla QA (:ashughes) from comment #3) > Is this only happening on Mac OSX when you force Firefox to use 32-bit mode? Yes, only on Mac OS X in 32-bit mode

(In reply to Manuela Muntean [:Manuela] [QA] from comment #4) > Yes, only on Mac OS X in 32-bit mode Thanks Mihaela, given that I don't see this as a high priority. I don't expect a lot of users use Firefox in this way. Roc, if there's something we can do to help we will but I don't think this needs urgent action.

I cannot reproduce this on a 32-bit Mac binary. Manuela, do you still see this on latest trunk?

(In reply to :Ehsan Akhgari (needinfo? me!) from comment #6) > I cannot reproduce this on a 32-bit Mac binary. Manuela, do you still see > this on latest trunk? on Mac OS X 10.8.4: 1) I can't reproduce this issue with the latest Nightly (build ID: 20131003030203 in 32-bit mode 2) I can't also reproduce with latest beta - 25 beta 4 - build ID: 20131001024718, in 32-bit mode