Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Search Support

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.

Learn More
Arquivado

The plus sign has disappeared from my tab bar

emerstart

Two days ago the plus sign at the far right of my tabs bar vanished. How can I get it back?

Two days ago the plus sign at the far right of my tabs bar vanished. How can I get it back?

All Replies (2)

Try right-clicking the 3 bar menu or a toolbar and selecting Customise toolbar. You may find add tab bar there. It apparently looks different on the Customise page. If you can't find it there either, press the button labelled Restore Defaults bottom right of that page.

https://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars

Are you possibly using code in userChrome.css that is broken and that needs an update?

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