Indeed, the firefox version available from the ubuntu-mozilla-security ppa, namely 55.0.2+build1-0ubuntu0.17.04.1 seems to fix the issue
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1710987 Title: Since the update to 55.0.1 firefox hangs frequently with 100% cpu usage To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1710987/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs