Your user agent shows that you run a Firefox 44 version in compatibility mode for Windows 95 (NT 4.0). *Mozilla/5.0 (Windows NT 4.0; rv:44.0) Gecko/20100101 Firefox/44.0 Check that you do not run Firefox in compatibility mode. You can open the Properties of the Firefox desktop shortcut via the right-click context menu and check the "Compatibility" tab. Make sure that all items are deselected in the "Compatibility" tab of the Properties window. You may have a corrupted user agent. See: *https://support.mozilla.org/en-US/kb/how-reset-default-user-agent-firefox *https://support.mozilla.org/en-US/kb/Finding+your+Firefox+version *https://support.mozilla.org/en-US/kb/websites-say-firefox-outdated-or-incompatible If you really run Firefox 44 then please update to the current release. *https://support.mozilla.org/en-US/kb/update-firefox-latest-version