[CentOS] C7, just updated firefox, bugs

I just updated the "critical" firefox update, and it is *seriously* buggy.

1. I killed my old session, and started a new. Many (all?) tabs show
*nothing* until I put my cursor in the URL bar and hit <enter>
2. I cannot open a link in an email in thunderbird. I click the link, and
after a bit (30 sec? more?) a small windows tells me that firefox is
running, but not responding, which it certainly responds when I focus on
firefox.

     mark