The same problem here on Lubuntu 16.04.1 amd64, starting in safe mode does not cure it.
lsb_release -rd Description: Ubuntu 16.04.1 LTS Release: 16.04 apt-cache policy firefox firefox: Telepítve: 51.0.1+build2-0ubuntu0.16.04.1 Jelölt: 51.0.1+build2-0ubuntu0.16.04.1 Verziótáblázat: *** 51.0.1+build2-0ubuntu0.16.04.1 500 500 http://archive.ubuntu.com/ubuntu xenial-security/main amd64 Packages 100 /var/lib/dpkg/status 50.1.0+build2-0ubuntu0.16.04.1 500 500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages 45.0.2+build1-0ubuntu1 500 500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages I cannot attach the output of the 'ubuntu-bug firefox' file. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1659922 Title: Firefox 51.0.1 после обновления в Ubuntu 16.04 x32 не отображает содержимое сайтов To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1659922/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs