Hi, suggest a few things, I think the issue is the use of the Browser Privacy Extension that your running : https://addons.mozilla.org/firefox/addon/browser-privacy/ it should be noted what permissions this Extension is offering for what it takes from you : *Access your data for all websites *Exchange messages with programs other than Firefox &Access browser tabs *Access browser activity during navigation Note that the adblockers Ghostery and uBlock Origin will perform more for less intrusion. https://addons.mozilla.org/firefox/addon/ghostery/ https://addons.mozilla.org/en-GB/firefox/addon/ublock-origin/ As this Extension has access to your tabs/navigation am thinking this is causing the issue. Should Disable it. Then please do this as you are a version behind : *https://support.mozilla.org/en/kb/update-firefox-latest-version We shall quickly find out as your running version 61.0.1 and 61.0.2 is available. Your Web Security Extension does not have much of a reputation and has not been updated for 6mos. https://addons.mozilla.org/firefox/addon/web-security/ Recommend Norton and/or Malwarebytes Extensions : https://addons.mozilla.org/firefox/addon/norton-safe-web/ https://addons.mozilla.org/firefox/addon/malwarebytes/