I confirm this behaviour. My firefox (spanish translation with the extensions "adblock filterset.G updater", "adblock plus" and "flashblock") also ocasionally goes to the top of the page when clicking a link. So far I haven't experienced the same with epiphany, although I have used it for a couple of minutes.
BTW: Can the affected package be chaged to "firefox"? -- ain't executing links as it should some times https://launchpad.net/bugs/67633 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs