See url testcase, this crashes current trunk builds. This regressed for me between 2006-03-08 and 2006-03-11. A narrower regression window would be appreciated. You would normally expect an error in the js console, something like: Error: uncaught exception: [Exception... "Unable to create an instance of the desired COM classCOM Error Result = 800401f3" nsresult: "0x80570039 (NS_ERROR_XPC_COM_CREATE_FAILED)" location: "JS frame :: javascript:window.GeckoActiveXObject(""); void 0; :: <TOP_LEVEL> :: line 1" data: no]

Talkback ID: TB21051073G CommonConstructor 0x02809f50 0x01271734 XPC_WN_NoCall_JSOps Jay also crashed with a similar testcase, talkback ID: 21050197 CommonConstructor [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/js/src/xpconnect/src/XPCIDispatchExtension.cpp, line 108] ActiveXConstructor [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/js/src/xpconnect/src/XPCIDispatchExtension.cpp, line 131] js_Invoke [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/js/src/jsinterp.c, line 1188] js_Interpret [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/js/src/jsinterp.c, line 3584] js_Invoke [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/js/src/jsinterp.c, line 1208] js_InternalInvoke [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/js/src/jsinterp.c, line 1285] JS_CallFunctionValue [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/js/src/jsapi.c, line 4177] nsJSContext::CallEventHandler [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/dom/src/base/nsJSEnvironment.cpp, line 1411] nsJSEventListener::HandleEvent [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/dom/src/events/nsJSEventListener.cpp, line 195] nsEventListenerManager::HandleEventSubType [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/content/events/src/nsEventListenerManager.cpp, line 1687] nsEventListenerManager::HandleEvent [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/content/events/src/nsEventListenerManager.cpp, line 1788] nsGenericElement::HandleDOMEvent [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/content/base/src/nsGenericElement.cpp, line 2185] nsHTMLButtonElement::HandleDOMEvent [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/content/html/content/src/nsHTMLButtonElement.cpp, line 336] PresShell::HandleEventInternal [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/layout/base/nsPresShell.cpp, line 6379] PresShell::HandleEventWithTarget [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/layout/base/nsPresShell.cpp, line 6277] nsEventStateManager::CheckForAndDispatchClick [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/content/events/src/nsEventStateManager.cpp, line 3048] nsEventStateManager::PostHandleEvent [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/content/events/src/nsEventStateManager.cpp, line 2026] PresShell::HandleEventInternal [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/layout/base/nsPresShell.cpp, line 6451] PresShell::HandleEvent [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/layout/base/nsPresShell.cpp, line 6215] nsViewManager::HandleEvent [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/view/src/nsViewManager.cpp, line 2559] nsViewManager::DispatchEvent [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/view/src/nsViewManager.cpp, line 2246] HandleEvent [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/view/src/nsView.cpp, line 174] nsWindow::DispatchEvent [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/widget/src/windows/nsWindow.cpp, line 1258] nsWindow::DispatchMouseEvent [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/widget/src/windows/nsWindow.cpp, line 6028] ChildWindow::DispatchMouseEvent [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/widget/src/windows/nsWindow.cpp, line 6279] nsWindow::WindowProc [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/widget/src/windows/nsWindow.cpp, line 1440] USER32.dll + 0x8734 (0x77d48734) USER32.dll + 0x8816 (0x77d48816) USER32.dll + 0x89cd (0x77d489cd) USER32.dll + 0x8a10 (0x77d48a10) nsAppShell::Run [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/widget/src/windows/nsAppShell.cpp, line 159] nsAppStartup::Run [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/toolkit/components/startup/src/nsAppStartup.cpp, line 151] main [c:/builds/tinderbox/Fx-Mozilla1.8.0-Release/WINNT_5.2_Depend/mozilla/browser/app/nsBrowserApp.cpp, line 61] kernel32.dll + 0x16d4f (0x7c816d4f)

Can't find a regression range. They crash irregularly.

*** This bug has been marked as a duplicate of 344960 ***