nsXPConnect::InitJSContext() is failing because it finds the JSContext in its map. I talked with jband about this, and he believes that the problem has to do with a recycled pointer. Said we needed to implement a method for telling xpconnect that a JSContext is getting tossed, so that he can unmap it.

adding myself to cc: list as this bug manifests itself in mail usage, causing crashes. See dup bug 5719

I'm about to mark 5719 as a dup of this bug but we have 5719 as a M6 stopper bug because it crashes mail after displaying several messages in a row. Can we set the fix for this as M6 as well?

*** Bug 5719 has been marked as a duplicate of this bug. ***

Pls change the severity of this bug to "major" or "critical" since a side effect is a crash on mail.

I have fixes for this in my tree. This required a bunch of small changes to xpconnect internals. I can't promise that there won't be new instabilities without really exercizing it in the browser. Do we want this to go into M6 or not?