Created attachment 207160 [details] Testcase This uses mousemove, but mouseover works just the same...
Yeah, the problem is that the window.open call has to spin an event loop until the window loads before returning; while it's doing that events to the page are not blocked. They really should be. We have existing bugs on this sort of thing.
*** Bug 340399 has been marked as a duplicate of this bug. ***
Created attachment 708570 [details] More verbose testcase 6 years later I ran over this issue with GWT code. The attachment shows the GWT problem reduced to its essence. In Issue 7926 (GWT issue tracker: http://code.google.com/p/google-web-toolkit/issues/detail?id=7926) I was adviced to file the issue to Mozilla.
Attachment #708570 - Attachment mime type: text/plain → text/html
I had the same issue with GWT code too. In attachment something that might help : https://github.com/gwtproject/gwt/issues/7923
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