Assertion failure: failedURI (We don't have a URI for history APIs.), at docshell/base/nsDocShell.cpp:7817 Opposite of bug 750145? Bug 820200 has the same assertion message, but otherwise seems unrelated.
> Opposite of bug 750145? Bug 750145 was about subframe loading. This bug seems independent. The main problem here is "unload" handler clears nsDocshell::mFailedURI, which must not be null during trying to display an error page. A little more serious problem is probably URILoader called DoContent() (and CreateContentViewer()) after |window.close()| would have been called.
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