Also since you mentioned you can no longer reproduce this and it doesn't seem firefox-specific, I'll close this but please feel free to reopen or report a new bug (perhaps against the kernel) if you run into the issue again.
** Changed in: firefox (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2066945 Title: Scrolling page with arrow keys no longer works To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2066945/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs