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Mozilla Firefox Critical Error Virus Scam Removal

Parasite may reinstall itself multiple times if you don't delete its core files. We recommend downloading SpyHunter to scan for malicious programs installed with it. This may save you hours and cut down your time to about 15 minutes. 

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More information on SpyHunter, steps to uninstallEULAThreat Assessment Criteria, and Privacy Policy.

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This page aims to help you remove Mozilla Firefox Critical Error Virus Scam. Our removal instructions work for Chrome, Firefox and Internet Explorer, as well as every version of Windows.

If you have Mozilla Firefox Critical Error Virus Scam on your computer, made part of your web browser (IE, Chrome, Opera, Firefox, Edge or whatever other browsing program you typically use), it is perfectly understandable if you are feeling frustrated and annoyed. Mozilla Firefox Critical Error Scam is a page-redirecting software that most researchers regard as a browser hijacker which kind of explains why it might have tried (and managed) to alter the appearance and the regular functionality of your browser. Such hijackers/redirects are notorious for their ability to take over the user’s browsers and make certain changes to them – the starting page and the new-tab page of the browser might get replaced as well as its default search engine. Additionally, it’s also possible that some new and unwanted toolbar gets added to your browsing program and, at times, there might even be intrusive and obstructive page redirects to random websites that you don’t really want or need to visit. Another typical (and unpleasant) trait of some hijackers is that they could also try to push certain products, online services or web stores by every so often displaying ads of them inside your browser. You get the idea – it’s annoying and, in fact, since you are already on this page, it is likely that you have already been faced with this unpleasantness and that you are, at the moment, actually looking for a way to handle it and remove it from your machine. Well, if this is indeed what you are going through right now, we are glad to inform you that you have landed exactly on the page where you can find the necessary information that can help you in the struggle against the hijacker known as Mozilla Firefox Critical Error Scam. Just keep on reading and you will find out all that you might need in order to eliminate the annoyance coming from the nagging page redirect.

What you need to know about browser hijackers

The one main thing to keep in mind with regards to any sort of software that displays behavior similar to that of Mozilla Firefox Critical Error Scam is the fact such page-redirects are mostly used for advertising purposes. They are basically software tools through which their creators are able to accumulate revenue by advertising different programs, applications, sites, search engines, Internet services, web stores and others, utilizing revenue-generating models such as the Pay-Per-View or the Pay-Per-Click.


Mozilla Firefox Critical Error Virus Scam Removal

If you have a Windows virus, continue with the guide below.

If you have a Mac virus, please use our How to remove Ads on Mac guide.

If you have an Android virus, please use our Android Malware Removal guide.

If you have an iPhone virus, please use our iPhone Virus Removal guide


Some of the steps will likely require you to exit the page. Bookmark it for later reference.

Reboot in Safe Mode (use this guide if you don’t know how to do it).



We get asked this a lot, so we are putting it here: Removing parasite manually may take hours and damage your system in the process. We recommend downloading SpyHunter to see if it can detect parasite files for you.

Press CTRL + SHIFT + ESC at the same time and go to the Processes Tab (the “Details” Tab on Win 8 and 10). Try to determine which processes are dangerous. 


Right click on each of them and select Open File Location. Then scan the files with our free online virus scanner:

Drag and Drop Files Here to Scan
Maximum file size: 128MB.

This scanner is free and will always remain free for our website's users. You can find its full-page version at:

Scan Results

Virus Scanner Result

After you open their folder, end the processes that are infected, then delete their folders. 

Note: If you are sure something is part of the infection – delete it, even if the scanner doesn’t flag it. No anti-virus program can detect all infections. 


Hold together the Start Key and R. Type appwiz.cpl –> OK.


You are now in the Control Panel. Look for suspicious entries. Uninstall it/them.

Type msconfig in the search field and hit enter. A window will pop-up:


Startup —> Uncheck entries that have “Unknown” as Manufacturer or otherwise look suspicious.


Hold the Start Key and R –  copy + paste the following and click OK:

notepad %windir%/system32/Drivers/etc/hosts

A new file will open. If you are hacked, there will be a bunch of other IPs connected to you at the bottom. Look at the image below:

hosts_opt (1)

If there are suspicious IPs below “Localhost” – write to us in the comments.

Open the start menu and search for Network Connections (On Windows 10 you just write it after clicking the Windows button), press enter.

  1. Right-click on the Network Adapter you are using —> Properties —> Internet Protocol Version 4 (ICP/IP), click  Properties.
  2. The DNS line should be set to Obtain DNS server automatically. If it is not, set it yourself.
  3. Click on Advanced —> the DNS tab. Remove everything here (if there is something) —> OK.



  • After you complete this step, the threat will be gone from your browsers. Finish the next step as well or it may reappear on a system reboot.

Right click on the browser’s shortcut —> Properties.

NOTE: We are showing Google Chrome, but you can do this for Firefox and IE (or Edge).


Properties —–> Shortcut. In Target, remove everything after .exe.

ie9-10_512x512  Remove Mozilla Firefox Critical Error Scam from Internet Explorer:

Open IE, click  IE GEAR —–> Manage Add-ons.

pic 3

Find the threat —> Disable. Go to IE GEAR —–> Internet Options —> change the URL to whatever you use (if hijacked) —> Apply.

firefox-512 Remove Mozilla Firefox Critical Error Scam from Firefox:

Open Firefoxclick  mozilla menu  ——-> Add-ons —-> Extensions.

pic 6

Find the adware/malware —> Remove.
chrome-logo-transparent-backgroundRemove Mozilla Firefox Critical Error Scam from Chrome:

Close Chrome. Navigate to:

 C:/Users/!!!!USER NAME!!!!/AppData/Local/Google/Chrome/User Data. There is a Folder called “Default” inside:

Rename the Folder to Backup Default

Rename it to Backup Default. Restart Chrome.


To remove parasite on your own, you may have to meddle with system files and registries. If you were to do this, you need to be extremely careful, because you may damage your system.

If you want to avoid the risk, we recommend downloading SpyHunter
a professional malware removal tool.

More information on SpyHunter, steps to uninstallEULAThreat Assessment Criteria, and Privacy Policy.

Type Regedit in the windows search field and press Enter.

Inside, press CTRL and F together and type the threat’s Name. Right click and delete any entries you find with a similar name. If they don’t show up this way, go manually to these directories and delete/uninstall them:

  • HKEY_CURRENT_USER—-Software—–Random Directory. It could be any one of them – ask us if you can’t discern which ones are malicious.
    HKEY_CURRENT_USER—-Software—Microsoft—-Windows—CurrentVersion—Run– Random
    HKEY_CURRENT_USER—-Software—Microsoft—Internet Explorer—-Main—- Random

If the guide doesn’t help, download the anti-virus program we recommended or try our free online virus scanner. Also, you can always ask us in the comments for help!

What this means is that, even if Mozilla Firefox Critical Error Scam might at first appear as a genuinely useful browser extension, it would likely soon turn into nothing but an annoyance that hardly ever benefits you in any way and is simply there to generate income for its creators without providing you with any real functional feature. Of course, that’s not necessarily always the case – there are some applications that might share certain similar characteristics with the hijacker category while still remaining a useful addition to your browsing programs. However, those are more of an exceptions so don’t expect a typical hijacker to be useful and not simply irritating and nagging.

It’s always better to have it removed

Hijackers aren’t as dangerous as malware viruses like Trojans, Worms, Ransomware and other similar threats. However, they are also not the safest and most reliable of software applications as well. Page-redirects like Mozilla Firefox Critical Error Scam, for instance, though typically being harmless by themselves, can still feed your browser with adverts and redirect you to sites that might not be too reliable. Furthermore, it is always possible that a certain ad or browser request might actually come from some malicious source which means that clicking on such online content might put your computer at risk of getting infected by some insidious Trojan Horse or Ransomware virus or some other similar malware infection. Uninstalling hijackers is always the preferable way to go so do not hesitate to you our guide manual for removing Mozilla Firefox Critical Error Scam that we have posted below the current article if you need to.

How did it get in your PC?

A lot of hijackers actually have official sites from where users might try to download them but let’s be honest – how many people would really want to get such software inside their computers. That said, the developers of page redirects like Mozilla Firefox Critical Error Scam still need to get their products to as many users as possible in order to generate bigger profit so how do they do that? Well, there are the spam e-mails, the misleading online ads, the fake update requests, as well as many sites with low or unclear reputation that might also be used to spread hijackers. One other possible method is file bundling – the hijacker is added another program’s installer and if it doesn’t get manually unchecked from the setup menu, it gets installed along that other program. Now, that you know what to be on the lookout for, we hope that you will be able to prevent hijackers like Mozilla Firefox Critical Error Scam from getting inside your machine in future.


Name Mozilla Firefox Critical Error Scam
Type Browser Hijacker
Danger Level Medium (nowhere near threats like Ransomware, but still a security risk)
Symptoms Most typical hijackers tend to mess with your browsers and alter their appearance and functionality which is considered the most obvious symptom that such programs cause.
Distribution Method File-bundles, malvertising, spam and any other social engineering method.
Detection Tool

Keep in mind, SpyHunter’s malware detection tool is free. To remove the infection, you’ll need to purchase the full version. More information about SpyHunter and steps to uninstall.

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