Critical Firefox Update

Critical Firefox Update

Browser hijackers like Critical Firefox Update are not virus infections or any kind of malware, however, they might create some serious inconvenience and browsing disturbance to users, therefore there are many people who would rather like to remove them. The probable source of all these strange activities might be Critical Firefox Update “Virus” – one of the many browser hijacker pieces of software that are available on the web.

In case that you’ve just noticed some strange modifications on your Chrome or Firefox, which you don’t remember approving, then most probably your browser might have been hijacked. These modifications might be related to your homepage or search engine, some new toolbar that might has appeared in your browser’s menu or unstoppable page redirects that might be landing you on various unknown and undesired web locations. If you are also feeling disturbed and don’t want to tolerate the imposed changes to your browser, then the removal guide that we have prepared below may be the permanent solution that you have been looking for. In the next lines, we will give you some essential information about the browser hijacker on your machine, the way it operates and, of course, the most effective ways to remove it and keep your system safe in the future.

What is Critical Firefox Update “Virus” Popup and why does it disturb me?

Most of the users, who have a close encounter with programs like Critical Firefox Update “Virus”, may find them quite irritating. Despite that these pieces of software are far from malicious programs like Trojans, Ransomware, and viruses and cannot do actual harm to your computer, they can be incredibly invasive and may heavily interrupt the users’ normal browsing. The reason for the browser hijackers being referred to as potentially unwanted software on your machine is their aggressive way of displaying different advertisements and their ability to impose some unauthorized changes to your default browser.

At first glance, a program like Critical Firefox Update “Virus” could appear to be quite useless since it can’t deliver much value for users. It can only display different types of advertisements and redirect them to numerous annoying pages, preventing them from landing on the websites they want. However, for the people who create and own browser hijackers, they can be very beneficial, since the ads that these programs usually display are connected to a remuneration scheme called Pay-Per-Click. So the moment you click on some of the hundreds of intrusive ads, the developers profit from your clicks. This is the reason why they basically hijack your browser and flood it with different sponsored messages, new tabs, promotional web pages and offers – they simply want to earn more money. For you, however, the ads-invasion may be too irritating to deal with, which may be a good reason to uninstall the browser hijacker from your computer. 

Are there some shady features about Critical Firefox Update “Virus” Popup that I should be aware of?

Even if a program like Critical Firefox Update “Virus” is not as dangerous as a Ransomware infection, for example, keeping it on your computer may still cause you some inconvenience. First of all, the changes in your browser may prevent you from browsing the web normally. Since these types of programs are constantly busy in displaying dozens of ads on your screen, they can also eat up a serious amount of your system resources for a rather useless activity. It is not uncommon that your PC may become a bit sluggish, your screen may freeze or your browser may stop responding and crash due to the excessive amount of sponsored messages it has been flooded with.

Another rather shady activity related to Critical Firefox Update “Virus” is its data collecting ability. Its creators may program it to collect information about your browsing habits, your search request history, your bookmarks and the most regular pages you visit. They may use this data for various marketing purposes, but what is more annoying is that they may not ask your approval for that, which may be considered as a privacy invasion. Uninstalling the browser hijacker, however, will give you a permanent solution to all that invasion and will make all of its annoying side effects and changes disappear.

How to uninstall Critical Firefox Update “Virus” Popup from my computer?

For the complete removal of Critical Firefox Update “Virus”, we suggest you follow the instructions in the guide below. It contains all the steps you need to take to get rid of the browser hijacker once and for all. If you don’t want to catch another one, however, here are a few safety tips we have for you. Beware of software bundles, which are commonly distributed on shareware and freeware platforms, torrent sites, spam or different installation managers. This is where browser hijackers could be found most commonly. So, to avoid installing them on your PC, always read the EULA before running a given software bundle and customize the setup through the “Advanced/Custom” option. This way, you will prevent any potentially unwanted program from getting installed on your PC along with the software you desire.


Name Critical Firefox Update
Type Browser Hijacker
Danger Level Medium (nowhere near threats like Ransomware, but still a security risk)
Symptoms Browser modifications, related to your homepage or search engine, some new toolbar  or unstoppable page redirects.
Distribution Method Software bundles, shareware and freeware platforms, torrent sites, spam or different installation managers.
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.

Critical Firefox Update “Virus” Popup Removal

If you are a Windows user, continue with the guide below.

If you are a Mac user, please use our How to remove Ads on Mac guide.

If you are an Android user, please use our Android Malware Removal guide.

Critical Firefox Update

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).

Critical Firefox Update

This is the most important step. Do not skip it if you want to remove Critical Firefox Update “Virus” successfully!

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. 

Critical Firefox Update

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

Critical Firefox Update
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
Critical Firefox UpdateClamAV
Critical Firefox UpdateAVG AV
Critical Firefox UpdateMaldet

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. 

Critical Firefox Update

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

Critical Firefox Update

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:

Critical Firefox Update

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

Critical Firefox Update

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:

Critical Firefox Update

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.

Critical Firefox Update

Critical Firefox Update

  • 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).

Critical Firefox Update

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

Critical Firefox Update

Critical Firefox Update  Remove Critical Firefox Update “Virus” from Internet Explorer:

Open IE, click  Critical Firefox Update —–> Manage Add-ons.

Critical Firefox Update

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

Critical Firefox Update Remove Critical Firefox Update “Virus” from Firefox:

Open Firefoxclick  Critical Firefox Update  ——-> Add-ons —-> Extensions.

Critical Firefox Update

Find the adware/malware —> Remove.
Critical Firefox UpdateRemove Critical Firefox Update “Virus” from Chrome:

Close Chrome. Navigate to:

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

Critical Firefox Update

Rename it to Backup Default. Restart Chrome.

Critical Firefox Update

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!


About the author


Lidia Howler

Lidia is a web content creator with years of experience in the cyber-security sector. She helps readers with articles on malware removal and online security. Her strive for simplicity and well-researched information provides users with easy-to-follow It-related tips and step-by-step tutorials.

Leave a Comment