How to Start Firefox in Safe Mode

Firefox has a mode for troubleshooting purpose, and that mode is “safe mode.”

You can launch the Firefox web browser in safe mode in five different ways. Here are they:

Method #1

Open Firefox web browser.

Click on Hamburger icon (three vertical lines) at the top. Hit on Help > Restart with Add-ons Disabled.

Restart with Add-ons Disabled option

In the popup, hit the “Restart” button.

Restart with Add-ons Disabled popup

Now, in the “Firefox Safe Mode” popup, you can see two buttons – “Start in Safe Mode” and “Refresh Firefox.” Hit the “Start in Safe Mode” button.

Firefox Safe Mode popup

That’s it. All done.

Note: Keep in mind that if you’ve any other already opened Firefox windows while doing the above steps, then those windows too will get launched in safe mode.

Before trying the below methods, make sure no other Firefox windows are already opened. Otherwise, the following ways will not open Firefox in safe mode, and they’ll open normal Firefox windows.

Method #2

Press “Shift” key and double-click on the Firefox shortcut.

Now, you can see the popup. Click on “Start in Safe Mode” button.

Method #3

Right-click on the Firefox shortcut (I suggest to change the shortcut name to “Firefox safe mode”) and select “Properties.”

In the “Target” field, append the following:


Appended -safe-mode

Click on the “OK” button. In the popup, click on the “Continue” button.

That’s all. From now on, when you open the shortcut, you’ll see “Firefox Safe Mode” popup. Click on “Start in Safe Mode” button to launch Firefox in safe mode.

Method #4

Open Run Command (Press Windows key + R).

Type “firefox -safe-mode” (without double quotes) and then press “Enter” key.

Run Command Box with command

That’s it. Now, you can see “Start in Safe Mode” button in the “Firefox Safe Mode” popup. Hit it.

Note: You can apply the same command in Address Toolbar, File Explorer Address Bar and Task Manager (In the Task Manager, hit File > Run new task).

Method #5

Open Command Prompt (Open Run Command, type cmd, and then hit “Enter” key).

Type “start firefox -safe-mode” (without double quotes) and then press “Enter” key.

Command Prompt with command

That’s all. Now, you can see “Firefox Safe Mode” popup. Click on “Start in Safe Mode” button.

Note: Close the safe mode windows to get out of safe mode.

Also see:

Firefox Keyboard Shortcuts

How to Enable or Disable Cookies on Firefox

Scroll to Top