Verified in rhevm-3.5.7-0.1.el6ev (vt19). Client: RHEL 6.7.0.3, firefox-38.4.0-1.el6_7 No message about unsupported browser is shown on login page of User Portal or Webadmin. Automated tests for UI sanity* passed. (*) basic CRUD operations with data centers, clusters, hosts, storages, VMs, disks and templates. Also VM consoles work correctly, including noVNC & SPICE HTML5.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2016-0029.html