STR: 1. Using a debug build, load http://unity3d.com/gallery/demos/live-demos 2. Play any of the demos at the bottom of the page RESULT: Many assertion failures about "Should have a valid plugin instance or not receive events" and "null plugin instance during PaintPlugin": [748] ###!!! ASSERTION: Should have a valid plugin instance or not receive events.: 'mInstance', file /Users/cpeterson/Code/mozilla/inbound/dom/plugins/base/nsPluginInstanceOwner.cpp, line 1733 [748] ###!!! ASSERTION: Should have a valid plugin instance or not receive events.: 'mInstance', file /Users/cpeterson/Code/mozilla/inbound/dom/plugins/base/nsPluginInstanceOwner.cpp, line 1733 [748] WARNING: null plugin instance during PaintPlugin: file /Users/cpeterson/Code/mozilla/inbound/layout/generic/nsObjectFrame.cpp, line 1707

All OSes?

I have only tested OS X 10.9.

Using the latest Nightly debug version I reproduced this on Mac OS X 10.9. On Windows 7 x64 and I get this: [5076] WARNING: NS_ENSURE_TRUE(currentURI) failed: file c:/builds/moz2_slave/m-c en-w32-d-000000000000000000/build/content/base/src/ThirdPartyUtil.cpp, line 96 For application/vnd.unity found plugin npUnity3D32.dll [4844] WARNING: XPCOM objects created/destroyed from static ctor/dtor: file c:/b uilds/moz2_slave/m-cen-w32-d-000000000000000000/build/xpcom/base/nsTraceRefcntIm pl.cpp, line 138 [4844] WARNING: XPCOM objects created/destroyed from static ctor/dtor: file c:/b uilds/moz2_slave/m-cen-w32-d-000000000000000000/build/xpcom/base/nsTraceRefcntIm pl.cpp, line 138 [5076] ###!!! ASSERTION: Received "nonqueued" message 295 during a synchronous I PC message for window 202796 ("MozillaWindowClass"), sending it to DefWindowProc instead of the normal window procedure.: 'Error', file c:/builds/moz2_slave/m-c en-w32-d-000000000000000000/build/ipc/glue/WindowsMessageLoop.cpp, line 309 On Windows XP x32, after Unity plugin is activated, nightly just quits. Console looks like this: For application/vnd.unity found plugin npUnity3D32.dll [2200] WARNING: XPCOM objects created/destroyed from static ctor/dtor: file c:/b uilds/moz2_slave/m-cen-w32-d-000000000000000000/build/xpcom/base/nsTraceRefcntIm pl.cpp, line 138 [2200] WARNING: XPCOM objects created/destroyed from static ctor/dtor: file c:/b uilds/moz2_slave/m-cen-w32-d-000000000000000000/build/xpcom/base/nsTraceRefcntIm pl.cpp, line 138 [3128] ###!!! ASSERTION: Received "nonqueued" message 295 during a synchronous I PC message for window 393880 ("MozillaWindowClass"), sending it to DefWindowProc instead of the normal window procedure.: 'Error', file c:/builds/moz2_slave/m-c en-w32-d-000000000000000000/build/ipc/glue/WindowsMessageLoop.cpp, line 309 [2200] WARNING: shutting down early because of crash!: file c:/builds/moz2_slave /m-cen-w32-d-000000000000000000/build/dom/plugins/ipc/PluginModuleChild.cpp, lin e 697 [2200] WARNING: plugin process _exit()ing: file c:/builds/moz2_slave/m-cen-w32-d -000000000000000000/build/dom/plugins/ipc/PluginModuleChild.cpp, line 662 nsStringStats => mAllocCount: 36 => mReallocCount: 1 => mFreeCount: 23 -- LEAKED 13 !!! => mShareCount: 21 => mAdoptCount: 0 => mAdoptFreeCount: 0 => Process ID: 2200, Thread ID: 1420

(In reply to Bogdan Maris, QA [:bogdan_maris] from comment #3) > On Windows XP x32, after Unity plugin is activated, nightly just quits. Are there any crash reports for this?

The Unity plugin crashes might be related to bug 932678, a Unity bug.

(In reply to Georg Fritzsche [:gfritzsche] from comment #4) > (In reply to Bogdan Maris, QA [:bogdan_maris] from comment #3) > > On Windows XP x32, after Unity plugin is activated, nightly just quits. > > Are there any crash reports for this? No crashes are registered in about:crashes.

Resolving as WONTFIX because we no longer support the Unity NPAPI plugin, or any other NPAPI plugins except Flash, in Firefox 52 (bug 1269807).