How to start Firefox in Safe Mode?

Sep 20, 2010

Safe Mode is a special Firefox startup mode that is used to troubleshoot various browser related issues. While you are in Safe Mode, your extensions and themes will be disabled. Any toolbar customizations will also be reverted back to their defaults. These changes are not permanent. But, Firefox Safe Mode includes a number of troubleshooting options that allow you to make permanent changes upon browser restart, such as disabling all add-ons or resetting user preferences. Want to run Firefox in Safe Mode? If yes, follow the steps shown below.

Start Firefox in Safe Mode:


  1. Close Firefox, if it was already running.
  2. In Windows, click Start button.
  3. Open All Programs list, go to the Mozilla Firefox folder and select Mozilla Firefox (Safe Mode).
  4. Firefox Safe Mode window with some troubleshooting options will appear.
  5. Press the Continue in Safe Mode button and Firefox will let you browse in Safe Mode.
  6. Safe Mode temporarily disables your themes, extensions and custom settings. If you want to make some or all of those changes permanent, use the check boxes in the Firefox Safe Mode window (see screenshot) and then press the Make Changes and Restart button.

Firefox Safe Mode


  1. Close Firefox.
  2. Click the Start button in Windows.
  3. Go to Run…
  4. Enter the following in the text field: firefox -safe-mode
  5. Hit the OK button.
  6. Firefox will start with Safe Mode window.

Linux: Go to your terminal and run:

/path/to/firefox/firefox -safe-mode

Mac OS X: Go to Utilities, open Terminal and then run:

/Applications/ -safe-mode

*If Firefox installation location is different, modify the path accordingly.

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