How to start Firefox in Safe Mode

Updated: 01/24/2018 by Computer Hope

To start Mozilla Firefox in Safe Mode, follow the steps below.

  1. Find the Firefox icon or click Start and type Firefox.
  2. Hold down the Shift key on the keyboard and then click the Firefox icon.
  3. In the Firefox Safe Mode window, click on the Start in Safe Mode option.

Firefox Safe Mode


If Firefox cannot start in Safe Mode, then repeat the above steps, but instead of starting in Safe mode, choose to Reset Firefox and reset all settings back to defaults.

Additional information