Can you attach a screenshot? *https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem *use a compressed image type like PNG or JPG to save the screenshot Are you using code in <b>userChrome.css</b> in the chrome folder in the Firefox profile folder that may need an update for the current releases ? *https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode More info about userChrome.css/userContent.css in case you are not familiar: *https://www.userchrome.org/what-is-userchrome-css.html *https://www.userchrome.org/how-create-userchrome-css.html *https://www.userchrome.org/firefox-changes-userchrome-css.html