How to remove Adware from Mozilla Firefox

By Chona Esjay | Posted on February 27, 2013 | Updated on May 1, 2016

Mozilla Firefox browser is one of the favorite targets of malware and adware authors. With the million users of this popular browser, chances are, majority of them may acquire potentially unwanted program coming from various makers.

Even if security software is installed, there are still slim chances that Firefox browser may be infected by adware or malware. For this reason, we are providing simple and yet effective way to remove adware and malware from Mozilla Firefox.


Ways to get rid of Adware and Malware from Firefox Browser

Removal steps on this page don’t require technical expertise to successfully remove adware from Mozilla Firefox. All you have to do is follow what is exactly stated on the guide and use all suggested tools. Keep in mind to download tools and programs only from official web page as stated on this method.

Step 1 : Remove Unwanted Add-ons from Firefox Browser

Add-ons and extensions are often used by most adware to integrate self into Firefox web browser. In this topic, we will discuss how you can remove the add-on to stop activities such as browser redirect, pop-up ads, and other unwanted functions caused by the adware.

1. Open Firefox browser.

2. Press Ctrl+Shift+A on your keyboard to bring out ‘Add-Ons Manager’. This will provide a list of all extensions and plugins installed.

3. Under Extensions, select the adware entry and click the Remove button.

Firefox Extensions
4. If it prompts ‘Restart Now’. Please restart Firefox and see if the changes you have made are successful.

Step 2 : Reset Configuration of Add-on

On some instances, removing the extensions alone will not get rid of the adware from Firefox. In this case, there is a trick to delete other hidden components using the configuration box.

1. On Firefox address bar, please type about:config.

2. If this is the first time you are using this feature, you will receive a warning, “This might void your warranty!” please click “I’ll be carefull, I promise!

Firefox Config
3. There is a search box below the address bar. Type the name of the adware to display a list of related entries.

4. One by one, right click on the adware entries and click Reset from the options. Please refer to the image below.

Firefox Reset Config

Step 3 : Scan the Computer with AdwCleaner

1. Download the tool called AdwCleaner from the location stated below.
Click here to download AdwCleaner (this will open a new window)

2. Once you have completed the download, please close all running programs on the computer.

3. Locate the file and double-click on adwcleaner_Ver.exe to start running the tool. Then, click on Scan button.


4. It searches for presence of harmful programs, plug-ins, add-ons, or any data that were found malicious and linked to adware or malware. You need to Clean all items detected by this tool.

5. Once scan is done, the tool may need to reboot your computer to finalize the cleaning process.

6. After reboot, AdwCleaner will display the log file of the recent scan.

Step 4 : Use Malwarebytes Anti-malware to totally clean Firefox

1. Download Malwarebytes Anti-Malware from the link below. Save the file on your hard drive.

Click here to download MBAM (this will open a new window)

2. Once the download completes, double-click on the file MBAM-SETUP.EXE to run the program.

3. Select desired installation language when it prompts you. Then, click OK.

4. On the welcome screen, it will ask you to close all opened programs and disable ant-virus and firewall, please do so to avoid conflicts. Then click Next.

MBAM Welcome Screen

5. Next window is about License Agreement, you must accept this and click the Next button. Proceed with the succeeding prompts until you reach the window Ready to Install. Click on Install button.

6. Installation process will take less than a minute. Leave “Launch Malwarebytes Anti-Malware” with check mark. Then, click on Finish to run the program.

MBAM Installed

7. When Malwarebytes Anti-Malware interface appears, please select Threat Scan. Click on Scan Now button to begin the process. The program will check for any available update before proceeding. Do not skip this step. Virus scan may take a while, please wait for the process to finish.

MBAM Threat Scan

8. When scanning is done, Malwarebytes Anti-Malware will display the list of identified threats. Remove all and restart the computer to finalized the scan process.