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This occurred occasionally, but just now I dumped full thread dump to take a closer look. The behaviour is like this: the IDE at certain moment stops respond to user events (key, mouse). Form the thread dump one can see that the event dispatch thread went into MozSwing and native code, and it seems got stuck there and not return. Attaching the thread dump. Please, let me know, in case there is some issue with client code call.
Created attachment 63617 [details] full thread dump, after the problem occurrs
Created attachment 64020 [details] stacktrace where mozilla hangs
the attached stacktrace above shows IDE hangs due to nesting of gtk event loop in mozilla
fixed rev 89305:d8a8f8d9c016 as consequence, the race condition bug with gtk l&f was found http://monaco.sfbay.sun.com/detail.jsf?cr=6729405