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An extension is hiding your tabs

Some extensions can manage or hide tabs (for example, tab managers or vertical tab extensions). If tabs seem to disappear, they may be controlled by an extension.

  1. Open Menu > Add-ons and themes > Extensions.
  2. Disable the tab‑related extension to restore default tab behavior.
  3. Re‑enable it and check the extension’s settings to adjust how it groups or hides tabs.

Tip: Some extensions add a sidebar or toolbar button to switch tab views or groups.