https://event-loop-tests.glitch.me/red-green-flash.html Try to open inspector with the above page open. It opens, then the tab crashes. Spotted in TP46.
Fixed by bug 180787: <https://trac.webkit.org/changeset/225892> Apparently that didn't make it into STP 46 (225266-225841). *** This bug has been marked as a duplicate of bug 180787 ***