Reset Mozilla Firefox to default settings (Step-by-Step Guide)

If Firefox starts to act slow, crashes, or displays unwanted advertisements, resetting it to the default settings can help. The reset feature fixes many issues by restoring Firefox to its factory default state while saving your essential information like bookmarks and open tabs.

Resetting your browser settings will impact the settings below:

• Default search engine and saved search engines will be reset and to their original defaults.
• Homepage button will be hidden and the URL that you previously set will be removed.
• Default startup tabs will be cleared.
• New Tab page will be empty unless you have a version of Firefox with an extension that controls it. In that case, your page may be preserved.
• Pinned tabs will be unpinned.
• Content settings will be cleared and reset to their installation defaults.
• Cookies and site data will be cleared.
• Extensions and themes will be disabled.

In the below steps, we’ll cover how to reset Firefox to its default settings on Windows, Mac, or Android.

How to reset Firefox to its Default Settings (Help Guide)

If you’re having problems with Firefox, resetting it can help. The reset feature fixes many issues by restoring Firefox to its factory default state while saving your essential information like bookmarks, passwords, web form auto-fill information, browsing history, and open tabs.

How to remove malware from Windows. Clean-up your PC from malware.

While resetting Firefox may remove the malware from the browser, your Windows may still be infected with adware, potentially unwanted programs or other forms of malware.
The below steps are optional and are meant to be used if you still having issues with adware, browser hijackers or any other form of malware after resetting Firefox.

To remove adware, browser hijackers, or malware from Firefox, follow these steps:

• STEP 1: Use Malwarebytes Free to remove adware and browser hijackers
• STEP 2: Use HitmanPro to scan for malware and unwanted programs
• STEP 3: Double-check for malicious programs with AdwCleaner

STEP 1: Use Malwarebytes Free to remove adware and browser hijackers

Malwarebytes Free is one of the most popular and most used anti-malware software for Windows, and for good reasons. It is able to destroy many types of malware that other software tends to miss, without costing you absolutely nothing. When it comes to cleaning up an infected device, Malwarebytes has always been free and we recommend it as an essential tool in the fight against malware.
It is important to note that Malwarebytes Free will run alongside antivirus software without conflicts.

1. Download Malwarebytes Free.

   You can download Malwarebytes by clicking the link below.

   MALWAREBYTES DOWNLOAD LINK
   (The above link will open a new page from where you can download Malwarebytes)

2. Double-click on the Malwarebytes setup file.

   When Malwarebytes has finished downloading, double-click on the MBSetup file to install Malwarebytes on your computer. In most cases, downloaded files are saved to the Downloads folder.

   
   You may be presented with an User Account Control pop-up asking if you want to allow Malwarebytes to make changes to your device. If this happens, you should click “Yes” to continue with the Malwarebytes installation.
   

3. Follow the on-screen prompts to install Malwarebytes.

   When the Malwarebytes installation begins, you will see the Malwarebytes setup wizard which will guide you through the installation process. The Malwarebytes installer will first ask you on what type of computer are you installing this program, click either Personal Computer or Work Computer.
   

   On the next screen, click “Install” to install Malwarebytes on your computer.
   

   When your Malwarebytes installation completes, the program opens to the Welcome to Malwarebytes screen. Click the “Get started” button.

4. Select “Use Malwarebytes Free”.

   After installing Malwarebytes, you’ll be prompted to select between the Free and the Premium version. The Malwarebytes Premium edition includes preventative tools like real-time scanning and ransomware protection, however, we will use the Free version to clean up the computer.
   Click on “Use Malwarebytes Free“.
   

5. Click on “Scan”.

   To scan your computer with Malwarebytes, click on the “Scan” button. Malwarebytes will automatically update the antivirus database and start scanning your computer for malware.
   

6. Wait for the Malwarebytes scan to complete.

   Malwarebytes will scan your computer for adware and other malicious programs. This process can take a few minutes, so we suggest you do something else and periodically check on the status of the scan to see when it is finished.
   

7. Click on “Quarantine”.

   When the scan has completed, you will be presented with a screen showing the malware infections that Malwarebytes has detected. To remove the malicious programs that Malwarebytes has found, click on the “Quarantine” button.
   

8. Restart computer.

   Malwarebytes will now remove all the malicious files and registry keys that it has found. To complete the malware removal process, Malwarebytes may ask you to restart your computer.
   
   When the malware removal process is complete, you can close Malwarebytes and continue with the rest of the instructions.

STEP 2: Use HitmanPro to scan for malware and unwanted programs

HitmanPro is a second opinion scanner that takes a unique cloud-based approach to malware scanning. HitmanPro scans the behavior of active files and also files in locations where malware normally resides for suspicious activity. If it finds a suspicious file that’s not already known, HitmanPro sends it to their clouds to be scanned by two of the best antivirus engines today, which are Bitdefender and Kaspersky.

Although HitmanPro is shareware and costs $24.95 for 1 year on 1 PC, there is actually no limit in scanning. The limitation only kicks in when there is a need to remove or quarantine detected malware by HitmanPro on your system and by then, you can activate the one-time 30-day trial to enable the clean up.

1. Download HitmanPro.

   You can download HitmanPro by clicking the link below.

   HITMANPRO DOWNLOAD LINK
   (The above link will open a new web page from where you can download HitmanPro)

2. Install HitmanPro.

   When HitmanPro has finished downloading, double-click on “hitmanpro.exe” (for 32-bit versions of Windows) or “hitmanpro_x64.exe” (for 64-bit versions of Windows) to install this program on your PC. In most cases, downloaded files are saved to the Downloads folder.
   
   You may be presented with an User Account Control pop-up asking if you want to allow HitmanPro to make changes to your device. If this happens, you should click “Yes” to continue with the installation.

3. Follow the on-screen prompts.

   When HitmanPro starts you will be presented with the start screen as shown below. Click on the “Next” button to perform a system scan.
   

4. Wait for the HitmanPro scan to complete.

   HitmanPro will now begin to scan your computer for malicious programs. This process will take a few minutes.
   

5. Click on “Next”.

   When HitmanPro has finished the scan, it will display a list of all the malware that the program has found. Click on the “Next” button to remove the malicious programs.
   

6. Click on “Activate free license”.

   Click on the “Activate free license” button to begin the free 30 days trial and remove all the malicious files from your PC.
   
   When the process is complete, you can close HitmanPro and continue with the rest of the instructions.

STEP 3: Double-check for malicious programs with AdwCleaner

AdwCleaner is a free popular on-demand scanner which can detect and remove malware that even the most well-known anti-virus and anti-malware applications fail to find.
While the Malwarebytes and HitmanPro scans are more than enough, we’re recommending AdwCleaner to users who still have malware related issues or just want to make sure their computer is 100% clean.

1. Download AdwCleaner.

   You can download AdwCleaner by clicking the link below.

   ADWCLEANER DOWNLOAD LINK
   (The above link will open a new web page from where you can download AdwCleaner)

2. Double-click on the setup file.

   Double-click on the file named “adwcleaner_7.x.x.exe” to start AdwCleaner. In most cases, downloaded files are saved to the Downloads folder.
   
   You may be presented with a User Account Control dialog asking you if you want to run this file. If this happens, you should click “Yes” to continue with the installation.
   

3. Click on “Scan Now”.

   When AdwCleaner will start, click on the “Scan Now” button to perform a system scan.
   

4. Wait for the AdwCleaner scan to complete.

   AdwCleaner will now scan your PC for malicious files. This process can take a few minutes.
   

5. Click on “Clean & Repair”.

   When AdwCleaner has finished it will display a list of all the malware that the program found. Click on the “Clean & Repair” button to remove the malicious files from your computer.
   

6. Click on “Clean & Restart Now”

   When the malware removal process is complete, AdwCleaner may need to restart your device. Click on the “Clean & Restart Now” button to finish the removal process.
   

Firefox should now have the default settings, and your device should now be free of malware. If your current antivirus allowed this malicious program on your computer, you may want to consider purchasing the full-featured version of Malwarebytes Anti-Malware to protect against these types of threats in the future. If you are still having problems with your computer after completing these instructions, then please follow one of the steps:

• Run a system scan with Zemana AntiMalware Free
• Ask for help in our Malware Removal Assistance for Windows forum.