34.0a1 (2014-08-25), Win 8.1 x64 STR: 1. Open http://files.unity3d.com/jonas/DT2/ 2. Click 'Play' on the first map 3. Allow fullscreen 4. Click 'Continue' in the 'Unresponsive script' window 5. After the game starts, press ESC/End Game to exit to menu Actual results: After the step 4, the FF tab in the taskbar disappeared completely. After the step 5, the tab is restored but without the FF icon

Repro on FF 31

(In reply to Paul Silaghi, QA [:pauly] from comment #1) > Repro on FF 31 Can you please check if this happens with any other games, particularly Unity games, and if it goes farther back then Firefox 31? Also worth checking if this reproduces on any other operating systems, particularly other versions of Windows.

Couldn't reproduce with other unity games (stealth, angrybots), flash games. The first nightly this demo is able to start on is 25.0a1 (2013-07-20) and reproduces the problem. Couldn't reproduce on Win 7 x64, OS X 10.8.5, Ubuntu 13.04 x64. On Win XP x86 the game doesn't start at all - "out of memory exception" - probably 32-bit platform problem, similar to bug 870705.

Erin, would you be able to escalate this to Unity? It doesn't appear to be a regression on our end. I'm wondering if they could provide older versions of this demo to see if it's a regression in the game itself.

FYI: Working on this.