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Remove an extension

Removing an extension deletes it and its data from this device. Turning it off keeps it, ready to turn on again.

You tried a reading-list extension and don’t use it.

  1. Open Settings › Extensions.
  2. Under Installed, select the extension’s name.
  3. Under Remove, select Remove.
  4. In the dialog, select Remove.

Sval says Removed and the extension’s name.

  • To keep the extension but stop it from running, turn off its switch in the Installed list, or On on its page.
  • Removing an extension on this device doesn’t remove it on your other devices.
  • An extension Sval can’t remove has no Remove card on its page.

© 2026 Ellm Tree, Inc. Sval is not officially associated with Mozilla or its products. Firefox is a trademark of the Mozilla Foundation in the US and other countries.