How to Remove Adware from Mozilla Firefox

Mozilla Firefox is the third leading browser available on the internet, with roughly 12% market share (according to netmarketshare), so it’s no surprise that adware creators target this browser as much as Google Chrome and Internet Explorer. In this article “How to Remove Adware from Mozilla Firefox” we will walk you through the removal process of adware and any other potentially unwanted programs (PUPs) from Mozilla Firefox.

When Mozilla Firefox is affected by adware or any unknown extensions, you may notice a decrease in performance, frequent pop-up advertisements such as text links and banner ads, and redirect to third-party websites. Remove any PUPs and adware from Mozilla Firefox by following the guide below.

How to remove Adware from Mozilla Firefox

Step #1 – Clearing/Disabling Unwanted Extensions and Themes

  1. Click the menu button and choose Add-ons, or go to about:addons in the Firefox search bar
  2. In the Add-ons Manager tab, clicks on the Extensions or Appearance tab
  3. Select the Add-on(s) you wish to disable (we recommend disabling all unknown add-ons)
  4. Clicks its Remove button
  5. Click Restart now if Firefox asks you to.


Step #2 – Reset Firefox Homepage, Default Search and New Tab Settings

  1. Clicks the menu button and choose Options
  2. One General tab, look for the homepage field and click the Restore to Default button
  3. Navigate to the Search tab and choose your Default Search Engine
  4. In the browser bar, type in about:config. Click the “I’ll be careful, I promise!” button
  5. Search for “newtab” and change the Value to “about:newtab”


Step #3 – Reset Settings of Firefox Back to Default

As a last resort, we recommend resetting the factory settings to remove adware from Mozilla Firefox. To do this we will have to start Firefox in Safe Mode.

  1. Click the Menu button, click help and select Restart with Add-ons Disabled… at which point Firefox will start up w/ the Firefox Safe Mode Dialog
  2. Click the Refresh Firefox button to restore Firefox to its original state while savings your essential information.

Refresh Firefox

Just like that, Firefox is now restored back to it’s original state. The following items will be saved when refreshing Firefox:

  • Bookmarks
  • Browsing History
  • Passwords
  • Open windows and tabs
  • Cookies
  • Web form auto-fill information
  • Personal dictionary

The following items will be removed when refreshing Firefox:

  • Extensions and themes
  • Website permissions
  • Modified preferences
  • Added search engines
  • Download history
  • DOM storage
  • Security settings
  • Download Actions
  • Plugin Settings
  • Toolbar customizations
  • User styles
  • Social Features

This should completely remove adware from Mozilla Firefox assuming the adware is extension-based. However, there are still methods in which adware can affect Firefox without relying on browser extensions.

If you have followed these steps and are still being infected by pop-up advertisements and excessive banner ads, check out our guide on How to Remove Potentially Unwanted Programs from Your PC.

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