How to Start Firefox in Safe Mode

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This wikiHow teaches you how to restart your computer's Firefox browser into the Firefox's built-in "Safe Mode", which is a setting that disables all of your add-ons upon starting the browser. You can restart Firefox into Safe Mode if Firefox is already open, or you can use your computer's keyboard shortcut (or command line program) to force Firefox to open directly into Safe Mode. Keep in mind that you cannot start Firefox in Safe Mode on a smartphone or tablet.

Method 1
Method 1 of 3:

Restarting Firefox into Safe Mode

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    Click or double-click the Firefox app icon, which resembles an orange fox wrapped around a blue globe.
    • If you can't open Firefox due to issues for which you want to start Firefox in Safe Mode, skip ahead to the Windows or Mac method.
  2. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/1\/1e\/Start-Firefox-in-Safe-Mode-Step-2-Version-5.jpg\/v4-460px-Start-Firefox-in-Safe-Mode-Step-2-Version-5.jpg","bigUrl":"\/images\/thumb\/1\/1e\/Start-Firefox-in-Safe-Mode-Step-2-Version-5.jpg\/aid2011471-v4-728px-Start-Firefox-in-Safe-Mode-Step-2-Version-5.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    It's in the top-right corner of the Firefox page. Doing so prompts a drop-down menu to appear.
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  3. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/c\/c0\/Start-Firefox-in-Safe-Mode-Step-3-Version-5.jpg\/v4-460px-Start-Firefox-in-Safe-Mode-Step-3-Version-5.jpg","bigUrl":"\/images\/thumb\/c\/c0\/Start-Firefox-in-Safe-Mode-Step-3-Version-5.jpg\/aid2011471-v4-728px-Start-Firefox-in-Safe-Mode-Step-3-Version-5.jpg","smallWidth":460,"smallHeight":344,"bigWidth":728,"bigHeight":544,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    You'll find this option at the bottom of the drop-down menu.
  4. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/5\/55\/Start-Firefox-in-Safe-Mode-Step-4-Version-4.jpg\/v4-460px-Start-Firefox-in-Safe-Mode-Step-4-Version-4.jpg","bigUrl":"\/images\/thumb\/5\/55\/Start-Firefox-in-Safe-Mode-Step-4-Version-4.jpg\/aid2011471-v4-728px-Start-Firefox-in-Safe-Mode-Step-4-Version-4.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    It's at the top of the "Help" section of the drop-down menu.
  5. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/0\/01\/Start-Firefox-in-Safe-Mode-Step-5-Version-4.jpg\/v4-460px-Start-Firefox-in-Safe-Mode-Step-5-Version-4.jpg","bigUrl":"\/images\/thumb\/0\/01\/Start-Firefox-in-Safe-Mode-Step-5-Version-4.jpg\/aid2011471-v4-728px-Start-Firefox-in-Safe-Mode-Step-5-Version-4.jpg","smallWidth":460,"smallHeight":346,"bigWidth":728,"bigHeight":547,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    Doing so will close Firefox.
  6. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/d\/d0\/Start-Firefox-in-Safe-Mode-Step-6-Version-3.jpg\/v4-460px-Start-Firefox-in-Safe-Mode-Step-6-Version-3.jpg","bigUrl":"\/images\/thumb\/d\/d0\/Start-Firefox-in-Safe-Mode-Step-6-Version-3.jpg\/aid2011471-v4-728px-Start-Firefox-in-Safe-Mode-Step-6-Version-3.jpg","smallWidth":460,"smallHeight":349,"bigWidth":728,"bigHeight":553,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    This will prompt Firefox to re-open in Safe Mode.
  7. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/3\/39\/Start-Firefox-in-Safe-Mode-Step-7-Version-3.jpg\/v4-460px-Start-Firefox-in-Safe-Mode-Step-7-Version-3.jpg","bigUrl":"\/images\/thumb\/3\/39\/Start-Firefox-in-Safe-Mode-Step-7-Version-3.jpg\/aid2011471-v4-728px-Start-Firefox-in-Safe-Mode-Step-7-Version-3.jpg","smallWidth":460,"smallHeight":344,"bigWidth":728,"bigHeight":544,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    If Firefox's issues disappear while in Safe Mode, one or more of the add-ons you've installed is causing the issues.
  8. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/4\/42\/Start-Firefox-in-Safe-Mode-Step-8-Version-3.jpg\/v4-460px-Start-Firefox-in-Safe-Mode-Step-8-Version-3.jpg","bigUrl":"\/images\/thumb\/4\/42\/Start-Firefox-in-Safe-Mode-Step-8-Version-3.jpg\/aid2011471-v4-728px-Start-Firefox-in-Safe-Mode-Step-8-Version-3.jpg","smallWidth":460,"smallHeight":343,"bigWidth":728,"bigHeight":543,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    Go to the add-ons page by clicking ☰ , clicking Add-ons , and clicking the Extensions tab, then click Disable or Remove to the right of an add-on to either turn it off or delete it from Firefox.
    • You can also reset your entire browser to its default settings by clicking Restart with Add-ons Disabled , clicking Refresh Firefox when prompted, and clicking Refresh Firefox when asked again. This will remove all of your browser's settings and add-ons.
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Method 2
Method 2 of 3:

Starting Firefox in Safe Mode on Windows

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    In most cases, you can use a keyboard shortcut to open Firefox in Safe Mode. Find the Firefox icon on your desktop, in your taskbar, or in the Start menu; once you've found it, do the following:
    • Hold down ⇧ Shift .
    • Click or double-click the Firefox app icon.
    • Release ⇧ Shift when Firefox opens.
    • Click Start in Safe Mode when prompted.
    • Troubleshoot Firefox as needed.
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    Click the Windows logo in the bottom-left corner of the screen. A pop-up window will appear.
  3. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/3\/37\/Start-Firefox-in-Safe-Mode-Step-11-Version-3.jpg\/v4-460px-Start-Firefox-in-Safe-Mode-Step-11-Version-3.jpg","bigUrl":"\/images\/thumb\/3\/37\/Start-Firefox-in-Safe-Mode-Step-11-Version-3.jpg\/aid2011471-v4-728px-Start-Firefox-in-Safe-Mode-Step-11-Version-3.jpg","smallWidth":460,"smallHeight":349,"bigWidth":728,"bigHeight":552,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    Type in command prompt , then click
    Windows cmd
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    Command Prompt at the top of the Start window.
  4. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/5\/55\/Start-Firefox-in-Safe-Mode-Step-12-Version-3.jpg\/v4-460px-Start-Firefox-in-Safe-Mode-Step-12-Version-3.jpg","bigUrl":"\/images\/thumb\/5\/55\/Start-Firefox-in-Safe-Mode-Step-12-Version-3.jpg\/aid2011471-v4-728px-Start-Firefox-in-Safe-Mode-Step-12-Version-3.jpg","smallWidth":460,"smallHeight":343,"bigWidth":728,"bigHeight":543,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    Type in "C:\Program Files\Mozilla Firefox\firefox.exe" -safe-mode into Command Prompt.
    • If you installed Firefox in a different folder than the one that was recommended, you can try typing in start firefox -safe-mode instead.
  5. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/e\/ea\/Start-Firefox-in-Safe-Mode-Step-13-Version-3.jpg\/v4-460px-Start-Firefox-in-Safe-Mode-Step-13-Version-3.jpg","bigUrl":"\/images\/thumb\/e\/ea\/Start-Firefox-in-Safe-Mode-Step-13-Version-3.jpg\/aid2011471-v4-728px-Start-Firefox-in-Safe-Mode-Step-13-Version-3.jpg","smallWidth":460,"smallHeight":342,"bigWidth":728,"bigHeight":541,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    Doing so will run the command.
  6. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/f\/f9\/Start-Firefox-in-Safe-Mode-Step-14-Version-3.jpg\/v4-460px-Start-Firefox-in-Safe-Mode-Step-14-Version-3.jpg","bigUrl":"\/images\/thumb\/f\/f9\/Start-Firefox-in-Safe-Mode-Step-14-Version-3.jpg\/aid2011471-v4-728px-Start-Firefox-in-Safe-Mode-Step-14-Version-3.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    This will confirm your decision and open Firefox in Safe Mode, at which point you can proceed with troubleshooting your add-ons as necessary.
    • If you receive an error or you're not prompted to start Firefox in Safe Mode, try typing "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -safe-mode into Command Prompt and pressing ↵ Enter .
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Method 3
Method 3 of 3:

Starting Firefox in Safe Mode on Mac

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    In most cases, you can use a keyboard shortcut to open Firefox in Safe Mode. Find the Firefox icon in your Mac's Applications folder, in the Dock, or in Launchpad, then do the following:
    • Hold down the ⌥ Option key.
    • Click (or double-click) Firefox.
    • Release the ⌥ Option key when Firefox opens.
    • Click Start in Safe Mode when prompted.
    • Troubleshoot Firefox as needed.
  2. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/8\/8b\/Start-Firefox-in-Safe-Mode-Step-16.jpg\/v4-460px-Start-Firefox-in-Safe-Mode-Step-16.jpg","bigUrl":"\/images\/thumb\/8\/8b\/Start-Firefox-in-Safe-Mode-Step-16.jpg\/aid2011471-v4-728px-Start-Firefox-in-Safe-Mode-Step-16.jpg","smallWidth":460,"smallHeight":343,"bigWidth":728,"bigHeight":543,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    Click the magnifying glass-shaped icon in the top-right corner of the screen. A text box will appear.
  3. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/e\/e2\/Start-Firefox-in-Safe-Mode-Step-17.jpg\/v4-460px-Start-Firefox-in-Safe-Mode-Step-17.jpg","bigUrl":"\/images\/thumb\/e\/e2\/Start-Firefox-in-Safe-Mode-Step-17.jpg\/aid2011471-v4-728px-Start-Firefox-in-Safe-Mode-Step-17.jpg","smallWidth":460,"smallHeight":344,"bigWidth":728,"bigHeight":545,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    Type in terminal in Spotlight, then double-click
    Mac Terminal
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    Terminal in the resulting list of apps.
  4. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/1\/17\/Start-Firefox-in-Safe-Mode-Step-18.jpg\/v4-460px-Start-Firefox-in-Safe-Mode-Step-18.jpg","bigUrl":"\/images\/thumb\/1\/17\/Start-Firefox-in-Safe-Mode-Step-18.jpg\/aid2011471-v4-728px-Start-Firefox-in-Safe-Mode-Step-18.jpg","smallWidth":460,"smallHeight":344,"bigWidth":728,"bigHeight":545,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    Type /Applications/Firefox.app/Contents/MacOS/firefox -safe-mode into Terminal.
  5. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/d\/d8\/Start-Firefox-in-Safe-Mode-Step-19.jpg\/v4-460px-Start-Firefox-in-Safe-Mode-Step-19.jpg","bigUrl":"\/images\/thumb\/d\/d8\/Start-Firefox-in-Safe-Mode-Step-19.jpg\/aid2011471-v4-728px-Start-Firefox-in-Safe-Mode-Step-19.jpg","smallWidth":460,"smallHeight":341,"bigWidth":728,"bigHeight":540,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    Doing so runs your command.
  6. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/d\/d2\/Start-Firefox-in-Safe-Mode-Step-20.jpg\/v4-460px-Start-Firefox-in-Safe-Mode-Step-20.jpg","bigUrl":"\/images\/thumb\/d\/d2\/Start-Firefox-in-Safe-Mode-Step-20.jpg\/aid2011471-v4-728px-Start-Firefox-in-Safe-Mode-Step-20.jpg","smallWidth":460,"smallHeight":342,"bigWidth":728,"bigHeight":541,"licensing":"<div class=\"mw-parser-output\"><p>License: <a target=\"_blank\" rel=\"nofollow noreferrer noopener\" class=\"external text\" href=\"https:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a> (screenshot)<br>\n<\/p><\/div>"}
    This will confirm your decision and open Firefox in Safe Mode, at which point you can proceed with troubleshooting your add-ons as necessary.
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Community Q&A

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  • Question
    How do I start Firefox in safe mode without disabling the add-ons?
    Community Answer
    You can't. Part of the definition of "safe mode" is that it starts with add-ons disabled. That's because certain add-ons, or combination of add-ons, can cause Firefox to drastically slow down or crash immediately. If you were able to bypass or tweak this mode, it would no longer be "safe." Safe mode should really only be used to remove the add-on or settings that caused the crash in the first place.
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      Warnings

      • Resetting Firefox will result in all of your Firefox settings, add-ons, and data being removed.
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      About This Article

      Article Summary X

      1. Open Firefox.
      2. Click ☰ .
      3. Click Help .
      4. Click Restart with Add-ons Disabled .
      5. Click Restart , then click Start in Safe Mode .

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