diff -r 000000000000 -r 6474c204b198 layout/generic/test/test_bug421839-1.html
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/generic/test/test_bug421839-1.html Wed Dec 31 06:09:35 2014 +0100
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+ Test for Bug 421839
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+Mozilla Bug 421839
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+Moving with you mouse from above to below and back a few times across the iframe, shouldn't crash Mozilla
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