Same thing here, happens randomly with mostly video flash pages like youtube. It happens from just going to a different page from a bookmark, or from closing the tab, probably some other scenarios too. It freezes konqueror so you can't use it, but by killing nspluginviewer konqueror continues on to the page you were going to or closes the tab and works normally.
-- [feisty] konqueror freezes when closing a tab with a flash animation https://launchpad.net/bugs/92207 -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs
