How To Reset Mozilla Firefox To Its Default Settings (2019 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. The browser will show a new tab when you startup or continue where you left off if you’re on a Firefoxbook.
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.

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.

Go to the “Help” menu.

Click on Firefox’s main menu button, represented by three horizontal lines. When the drop-down menu appears, select the option labeled “Help“.
Click “Troubleshooting Information”.

From the Help menu, click on “Troubleshooting Information“.

If you’re unable to access the “Help” menu, type about:support in your address bar to bring up the Troubleshooting information page.
Click on “Refresh Firefox”

Click the “Refresh Firefox” button in the upper-right corner of the “Troubleshooting Information” page.
Confirm.

To continue, click on the “Refresh Firefox” button in the new confirmation window that opens.
Click on “Finish”.

Firefox will close itself and will revert to its default settings. When it’s done, a window will list the information that was imported. Click on the “Finish“.

Your old Firefox profile will be placed on your desktop in a folder named “Old Firefox Data“. If the reset didn’t fix your problem you can restore some of the information not saved by copying files to the new profile that was created. If you don’t need this folder any longer, you should delete it as it contains sensitive information.

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.

This malware removal guide may appear overwhelming due to the amount of the steps and numerous programs that are being used. We have only written it this way to provide clear, detailed, and easy to understand instructions that anyone can use to remove malware for free.
Please perform all the steps in the correct order. If you have any questions or doubt at any point, STOP and ask for our assistance.

The below instructions are for Windows users, however we also have an Android Guide and a Mac Guide which should help clean up your device.

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

STEP 1: Use Malwarebytes 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 Zemana AntiMalware Free

STEP 1: Use Malwarebytes to remove adware and browser hijackers

Malwarebytes 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.

The first time you install Malwarebytes, you’re given a free 14-day trial of the premium edition, which includes preventative tools like real-time scanning and specific protection from ransomware. After two weeks, it automatically reverts to the basic free version that will detect and clean up malware infections only when you run a scan. It is important to note that Malwarebytes will run alongside antivirus software without conflicts.

Download Malwarebytes.

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)
Double-click on the Malwarebytes setup file.

When Malwarebytes has finished downloading, double-click on the mb3-setup-consumer-x.x.x.xxxx.exe file to install Malwarebytes 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 Malwarebytes to make changes to your device. If this happens, you should click “Yes” to continue with the installation.
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. To install Malwarebytes on your PC, click on the “Agree and Install” button.
Click on “Scan Now”.

Once installed, Malwarebytes will automatically start and update the antivirus database. To perform a system scan, click on the “Scan Now” button.
Wait for the Malwarebytes scan to complete.

Malwarebytes will now start scanning 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.
Click on “Quarantine Selected”.

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 Selected” button.
Reboot your 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 the 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.

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)
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.
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.
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.
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.
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 Zemana AntiMalware Free

Zemana AntiMalware is a free popular on-demand antivirus 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 Zemana AntiMalware Free to users who still have malware related issues or just want make sure their computer is 100% clean.

Download Zemana AntiMalware.

You can download Zemana AntiMalware Free by clicking the link below.

ZEMANA ANTIMALWARE DOWNLOAD LINK
(The above link will open a new web page from where you can download Zemana AntiMalware)
Double-click on the setup file.

Double-click on the file named “Zemana.AntiMalware.Setup.exe” to start the installation of Zemana AntiMalware. 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.
Install Zemana AntiMalware Free.

Click on the “Next” button to install Zemana AntiMalware on your computer. Follow the on-screen prompts to complete the install process.
Click on “Scan Now”.

When Zemana AntiMalware will start, click on the “Scan Now” button to perform a system scan.
Wait for the Zemana AntiMalware scan to complete.

Zemana AntiMalware will now scan your computer for malicious files. This process can take a few minutes.
Click on “Apply Action”.

When Zemana AntiMalware has finished it will display a list of all the malware that the program found. Click on the “Apply Action” button to remove the malicious files from your computer.
Restart your computer.

When the malware removal process is complete, Zemana AntiMalware may need to restart your computer. Click on the “Reboot” button to restart your computer.

Firefox should now have the default settings, and your device should now be free of of malware. If you are still experiencing problems while trying to remove malware from your device, please do one of the following:

Run a system scan with Emsisoft Emergency Kit
Ask for help in our Malware Removal Assistance for Windows forum.