Firefox keeps crashing at startup? Firefox starts to become sluggish? If there is something wrong with your Firefox browser, through running Firefox in safe mode you may be able to troubleshoot the problems. Now in this post we will show you how to start Mozilla Firefox in safe mode on Windows 10. Five different ways are available.

Way 1: Start Firefox in safe mode from the Help Menu

Step 1: Start Firefox, if you haven’t done so.

Step 2: Click the three-line icon in the upper right corner of the Firefox window, and then click the question mark at the bottom of the pop-up menu. This will open the Help menu.

Open Help menu

Step 3: Click Restart with Add-ons Disabled in the Help menu.

Click Restart with add-ons disabled

Step 4: Click the Restart button in the pop-up dialog, so Firefox will disable all add-ons and be ready to restart.

Click Restart

Step 5: A ”Firefox Safe Mode” dialog will open and you need to click the ”Start in Safe Mode” button. Then Firefox will immediately start in safe mode with all add-ons disabled.

Click Start in safe mode

Way 2: Start Firefox in safe mode using the Shift key

Step 1: If you have put the Mozilla Firefox shortcut on your Windows 10 desktop, double click on the Firefox shortcut while holding the Shift key on your keyboard.

hold shift key

Step 2: Once the ”Firefox Safe Mode” dialog opens, click the Start in Safe Mode button. That’s it.

Way 3: Start Firefox in safe mode using Run command

Step 1: Open the Run dialog in Windows 10.

Step 2: Type in firefox –safe-mode and click OK.

type firefox -safe-mode

Step 3: Click the Start in Safe Mode in the dialog that opens.

Way 4: Start Firefox in safe mode using Command Prompt

Step 1: Open a Command Prompt window in Windows 10.

Step 2: Type in start firefox –safe-mode and hit Enter.

type start firefox -safe-mode

Step 3: Click the ”Start in Safe Mode” button.

Way 5: Use a shortcut to start Firefox in safe mode

If you need to frequently run Firefox in safe mode, you can change the Firefox shortcut properties so that you can start Firefox in safe mode by simply double clicking on the Firefox shortcut. Here are steps.

Step 1: Right click on the Mozilla Firefox shortcut on the desktop and select Properties from the context menu.

Step 2: In the ”Mozilla Firefox Properties” that opens, keep the Shortcut tab selected, add –safe-mode at the end of the Target field, and then click Apply followed by OK.

add -safe-mode

Step 3: When you double click the shortcut, the ”Firefox Safe Mode” dialog will open and you can click the Start in Safe Mode button.