Product Firefox Release Channel esr Version 50.1.0esr Build ID 20161208153507 OS Windows Vista OS Version 6.0.6000 bp-f7bd7733-a168-4c88-8965-3a4a00170723 Signature: js::jit::CodeGenerator::emitGetPropertyPolymorphic ---------------- [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? https://support.mozilla.org/kb/Firefox+is+already+running+but+is+not+responding https://support.mozilla.org/en-US/kb/firefox-slow-how-make-it-faster https://support.mozilla.org/en-US/kb/firefox-uses-too-many-cpu-resources-how-fix https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding