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Any idea why a web application would cause Firefox to crash with signiture "nsJSScriptTimeoutHandler::cycleCollection::UnmarkPurple(nsISupports*)"?

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When testing a .net web application repeatedly we run into the same crash in Firefox. It doesn't happen on any general control, but any of the divs that are used as buttons. Also doesn't happen every time, can take hours before it is seen again, but always seems to be the same signature

When testing a .net web application repeatedly we run into the same crash in Firefox. It doesn't happen on any general control, but any of the divs that are used as buttons. Also doesn't happen every time, can take hours before it is seen again, but always seems to be the same signature