Join the Mozilla’s Test Days event from 9–15 Jan to test the new Firefox address bar on Firefox Beta 135 and get a chance to win Mozilla swag vouchers! 🎁
This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.
Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.
Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.
switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window
See:
*https://support.mozilla.org/en-US/kb/pop-blocker-settings-exceptions-troubleshooting
Start Firefox in <b>Troubleshoot Mode</b> to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if <b>hardware acceleration</b> or if <b>userChrome.css/userContent.css</b> is causing the problem.
*switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
*do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window
*https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
*https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems
