Created attachment 548452 [details]
1. Apply the patch in bug 90268.
2. Make a 32-bit debug build (so Flash will work).
3. Load the testcase.
4. Quit the browser.
###!!! ASSERTION: Remote window should be null.: '!aWindow.window', file dom/plugins/ipc/PluginInstanceChild.cpp, line 2328
Created attachment 548453 [details]
This should be fixed in the latest version of the patch on bug 90268. Jesse - can you confirm?
I don't have Flash installed now.