How to Remove Mozilla Firefox Critical Error Message with Quick Steps

While looking for something in Mozilla Firefox, several users have come across a critical error. This is nothing but a fake message that is often sent by criminals to access the personal information of Firefox users. 

Most of the users fail to realize the trick played by unscrupulous persons. Such persons undertake various means of collecting confidential information and it is one of the common means. This error is quite similar to the Microsoft Edge Critical error and Internet Explorer Critical error. 

Perhaps you might have also received this error message but fortunate enough not to respond to it. Now, you might be wondering about how to get rid of this issue. Hence, you need to go through this article to fix the Mozilla Firefox critical error instantly.

Factors that Leads to Mozilla Firefox Critical Error:

You might have come across pop ups while using Mozilla Firefox. These pop ups are indirect ways to persuade users to visit infected websites. 

When users visit an infected website, they are automatically redirected to the Critical Error page in Mozilla Firefox. Then, they are prompted to enter a username and password. Since, the users don’t have the username and password, they make a call at the toll-free number which is given under the error message. 

So, if you make the call, then the hackers will get all your personal information at any time. Sometimes the users aren’t asked to make a call. Instead, they are asked to install some software on their computer. Once you install the software, Ad Hoc gets installed on your computer. 

As a result, viruses, malware, or other malicious programs enter your system and corrupt the data and hard drive. 

Methods to Eliminate Mozilla Firefox Critical Error:

Login as an administrator and back up all the data stored on your PC. Then, move on the methods as discussed below:

Method 1: Remove Adware Manually

Though it’s difficult to remove adware, you can make an attempt to do that by the following steps:

  1. Press the Windows key and ‘R’ simultaneously on the keyboard. 
  2. Type ‘appwiz.cpl’ in the Run dialog box and click ‘OK’ or press ‘Enter.’
  3. Scroll down the entries displayed on the Application Manager window and locate Adware. 
  4. Right-click on Adware and choose ‘Uninstall’ from the context menu. 
  5. Click ‘OK’ on the resulting popup and restart the system after uninstalling Adware. 
  6. Reopen Firefox and search for something to ensure that it is not showing the critical error. 
  7. Use a scanning software if you can’t identify the Adware manually. 

Note: Adware keeps on changing their names so that users can’t identify them. Thus, you can use the internet to confirm whether the software entries are authentic or not. 

Method 2: Reinstall Windows from the Scratch

If the previous solution fails to fix the error in question, then reinstall the Windows Operating System on your PC. There are four different ways to reinstall Windows as explained underneath:

Startup Repair

  1. Start your computer and press F2, F10, F12, or Del to access the BIOS menu. 
  2. Navigate to the boot submenu and select CD/DVD or Optical Drive as the 1st boot device.
  3. Click the ‘Save Changes’ button and close the window. 
  4. The computer automatically restarts and displays a message ‘Press any key to boot from CD or DVD…’ 
  5. You will then come across the Windows setup and the files saved on your PC will load automatically. 
  6. As the new screen appears, set your language and time preferences correctly. 
  7. Click ‘Next’ and you will find the ‘Repair your computer’ option below the ‘Install Now’ button. 
  8. Select the aforesaid option and the System Recovery Options appear. 
  9. The program looks for Windows installation and asks you to select your installation from the list. 
  10. If you find a single installation, then select it and tap the “Next’ button. 
  11. The Startup Repair tool scans your Windows files for errors and suggests solutions. 
  12. Sometimes the tool fixes the errors automatically. 
  13. Make sure to remove any flash drives or external hard drives from your PC. Otherwise, the Startup Repair tool won’t function properly. 
  14. The computer reboots for a few seconds and you need to click the ‘Finish’ button to complete the process. 

Perform a System Restore

  1. Repeat the steps discussed in the previous method to access the System Recovery Options. 
  2. On the System Recovery Options window select ‘System Restore.’
  3. Alternatively, you can go to the Start menu and click ‘Programs.’
  4. Choose ‘Accessories,’ select ‘System Tools’ and click the System Restore option. 
  5. If the System Restore option isn’t available, then type ‘system restore’ in the Windows search bar. 
  6. Select System Restore from the search result and choose a restore point that you have created before. 
  7. Tap on the ‘Next’ button and then the ‘Finish’ button to proceed. 
  8. Click ‘Yes’ on the confirmation dialog box to start the System Restore. 
  9. After receiving a message for the completion of system restore, open Firefox to ensure that you have fixed the issue. 

Perform a Clean Install

  1. Copy the important data to an external flash drive, hard drive, or DVD. 
  2. Know the product key of your Windows Operating System and list down the programs installed on your PC. 
  3. Insert the Windows installation disk into your PC and press F2, F10, F12, or Del to open the BIOS menu. 
  4. Go to Boot submenu and select CD/DVD or Optical Drive as the 1st boot device of your computer. 
  5. Select your preferred language and other preferences. 
  6. Read the terms of the Windows Operating System that you want to install and accept the agreement. 
  7. Select ‘Custom Installation’ to wipe the data and prepare the hard drive for reinstallation. 
  8. After reinstalling Windows, enter a name for your PC and create an initial user account. 
  9. Use the new account to log into your freshly installed Windows Operating System. 
  10. After the reinstallation files and programs won’t exist on your PC. So, transfer the data from the backup and install the necessary programs. 

Use the Recovery Console

The recovery console is a builtin repairing tool you can use if you don’t want the clean install of Windows. You can then use this method if your Windows Operating System has this builtin tool. 

  1. Boot your PC and repeatedly press F8 as the system boots up. 
  2. Windows will display a set of options from which you need to select ‘Repair your computer.’
  3. Click ‘Command Prompt’ and enter ‘bootrec /rebuildbcd’ in it. 
  4. Enter ‘bootrec /fixmbr’ and ‘bootrec /fixboot’ one after another in the Command Prompt.
  5. Press ‘Enter’ to execute the above commands and fix the MBR errors. 

Note: No matter which of the above methods you are using, backup all the files and folders saved on your PC. Otherwise, you have a high chance of losing data. 

Method 3: Uninstall and Reinstall Firefox

Since Windows 7 and 10 are the widely used Windows version, we have explained this method with respect to them. 

On Windows 7

  1. Open the Run application type ‘appwiz.cpl’ and press ‘Enter.’
  2. Scroll down the ‘Programs and Features’ window to find the Mozilla Firefox entry. 
  3. Right-click on the entry and select ‘Uninstall’ from the drop-down menu. 
  4. Uninstall Mozilla Firefox with the on-screen prompts and restart your computer. 
  5. Open a web browser and visit the official website of Mozilla Firefox. 
  6. Look for the latest version of Firefox and download it on your PC. 
  7. Navigate to the folder where you have downloaded the file setup and run the installer. 
  8. Windows displays a screen stating that Firefox was installed before and get a new copy. 
  9. Uncheck ‘Restore default settings and remove old add-ons for optimal performance’ option and click the ‘Reinstall’ button. 
  10. After reinstalling a fresh copy of Firefox, ensure that all your data, passwords, and bookmarks are intact. 

On Windows 10

  1. Press the Windows key and ‘R’ simultaneously to launch the Run application. 
  2. Enter ‘firefox.exe -p’ into the Run application to open the Profile Manager.
  3. Choose your Firefox profile and select the ‘Delete Profile’ and ‘Delete Files’ options. 
  4. It will erase all settings, bookmarks, and extensions saved in Firefox. 
  5. Skip step 3 if you do not want to erase everything from your browser. 
  6. Open the Control Panel window from the Start menu and click ‘Programs and Features.’
  7. Select ‘Mozilla Firefox’ and tap on the ‘Uninstall’ button. 
  8. Click ‘Next’ and then the ‘Uninstall’ button again. 
  9. Then, visit the Mozilla Firefox website and download the latest version of Firefox. 
  10. Run the installer to reinstall Firefox. 

Note: If you have deleted your old profile, then Firefox automatically creates a new one. Otherwise, the old profile will load in the new installation. 

Several Firefox users have fixed their browser with the aforesaid methods. If you can’t fix the Mozilla Firefox critical error by any of these methods, then leave a comment in the section below.