Product Firefox Release Channel esr Version 52.0.2esr Build ID 20170323110425 OS Windows Vista OS Version 6.0.6002 Service Pack 2 bp-0d91c305-fa89-4b9f-bc1f-a49e12170415 Signature: mozilla::layers::Layer::GetNextSibling -------------------- [https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode] {web link} by holding down the '''<Shift> ''(Mac=Options)''''' key, and then starting Firefox. A small dialog should appear. Click '''Start In Safe Mode''' (not Refresh). Is the problem still there?