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    <p>The root problem is that when Mozilla is embedded in another application, it incorrectly pumps Windows messages when it dispatches internal events. Mozilla uses an event system to coordinate across threads or to schedule deferred processing on a thread (see <a href="https://developer.mozilla.org/en/nsIThread" rel="nofollow noreferrer">nsIThread</a>, <a href="http://mxr.mozilla.org/mozilla-central/source/xpcom/threads/nsIEventTarget.idl" rel="nofollow noreferrer">nsIEventTarget</a>). If you embed a web page with a lot of active XMLHTTPRequests, for example, Mozilla will use its event dispatching interface to dispatch events back to javascript and it will pump windows messages as a side effect. Once Mozilla events are fully dispatched, it goes back to the main event loop.</p> <p>When Mozilla pumps windows messages, it doesn't include the extra processing done by the application's event loop - IsDialogMessage(), TranslateMessage(), PreTranslateMessage(), or any other pre-processing are skipped when Mozilla gets into this state. Symptoms therefore include tab key presses getting inserted as a character instead of being used for dialog navigation, keyboard hotkeys being sporadically ignored, or custom message pre-processing being sporadically skipped. For example, the Outlook 2007/2010 "Compose" screen sporadically loses keystrokes because it relies on custom message pre-processing to handle keyboard input.</p> <p>See <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=582790" rel="nofollow noreferrer">https://bugzilla.mozilla.org/show_bug.cgi?id=582790</a> for a patch that addresses the problem.</p>
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