Firefox-patch.js Removal (July 2018 Update)

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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This page aims to help you remove Firefox-patch.js. These Firefox-patch.js removal instructions work for Chrome, Firefox and Internet Explorer, as well as every version of Windows.

You’ve reached our page due to a possible infection with Firefox-patch.js, which you’ve probably became aware of thanks to the numerous ads in your browser. In fact this is an issue related to a pop-up message “Urgent Firefox Update“. In case you have concerns regarding the safety of this particular program, there’s no need to panic. Firefox-patch.js is a type of adware, which is by far not considered an actual threat to your system’s security. It’s not a virus, though many websites throughout the web will have you believe so, either due to their desire to scare you or due to simple misunderstanding of the topic. Nevertheless, programs like these are often classified as potentially unwanted, because they can be both extremely annoying and they can indirectly pose as a risk to you and your PC. For this reason we recommend to all users to remove the unwanted software. You can do this with the help of the instruction provided below. But let us first understand the basic principles adware functions by. This will also help you avoid future infections with it.

So, it’s not a virus – how is it a risk then?

True, it doesn’t share any of the typical characteristics of malware, like the infamous ransomware or Trojans, but there are several features to Firefox-patch.js that may open the doors for external security hazards. For one, adware is known for gathering the separate user’s browsing-related details in order to determine what he or she is interested in. This is only logical, because the adware developers depend on creating more appealing ads to make a profit. Their software operates based on the Pay per click scheme, which is a popular online business strategy, enabling the developers to earn money from each click their ads attract. The only unsettling thing about this is that all of the gathered information that has to do with your surfing habits can later be sold to third parties. Who they are and what they intend to do with the purchased data is, unfortunately, something we’ll never know and can therefore lead to possible data misuse.

Another aspect to adware that makes it highly undesirable to have is the fact that sometimes the displayed pop-ups, banners and box messages may not be legit. In fact, they could end up taking you to malicious websites, infested with harmful programs like the aforementioned ransomware, which is, by the way, the world’s number one cyber-security threat. This is, of course, a little bit of an extreme scenario, but the possibility is out there, nonetheless. This is also a reason why we urge users to abstain from interacting with any of the showcased adverts, no matter how tempting or attractive they may appear as. And if you’re still not convinced about removing Firefox-patch.js from your PC, here’s one more thing to consider. Though it may often be promoted as a browser-enhancing tool, it tends to be quite the opposite. As a result of the large quantity of advertising materials it generates and distributes, it may end up using a lot of your computer’s resources. As a result this may lead to sluggish performance, your browser freezing or even crashing.

How it invades your system

There are several ways you could have gotten Firefox-patch.js on your system and a few of them are: spam emails, clicking on ads that were intended to install in on your PC or other adware-related programs that may have brought it along with them. However, the most commonly applied tactic is program bundling. It’s the practice of including adware (or other software) in the installation package of a third-party program, which is usually distributed for free. Good places to find these include torrent sites, file sharing sites and various open-source download platforms. A reliable way to avoid infection would be to stay off websites like these altogether, but in today’s world, where everything is about sharing information and data – we realize that would be a non realistic expectation. Instead, you can be smarter about installing newly downloaded programs and having an educated approach towards the setup. Most users tend to opt for the default installation in the setup wizard, which allows the predetermined settings to be implemented. To prevent this from happening, you should customize the settings by choosing the advanced (custom) setup. This way you will see what else has been included and you will be able to uncheck anything that seems unwanted.


Name Firefox-patch.js
Type  Adware/Browser Hijacker
Danger Level Medium (nowhere near threats like Ransomware, but still a security risk)
Symptoms Numerous ads in various shapes and sizes, distributed throughout your browser.
Distribution Method Spam emails, other adware or clicking on certain ads are common methods; program bundling appears to the most effective one, though. 
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.


Firefox-patch.js Removal


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:

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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 Firefox-patch.js 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 Firefox-patch.js from Firefox:

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

pic 6

Find the adware/malware —> Remove.
chrome-logo-transparent-backgroundRemove Firefox-patch.js 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 didn’t help you, download the anti-virus program we recommended or ask us in the comments for guidance!


  • You should probably remove it since it is likely to be unwanted. Make sure to save the file after you delete the IP.

  • Yes, since it does not allow you to save the changes that way, here is what you should try and see if it works: Copy-past the following line into the Start Menu search bar: notepad %windir%/system32/Drivers/etc/hosts . Right-click onto the first of the results and select Run as Administrator. Now, the file will open with Administrator privileges and you should be able to edit it. Tell us in the comments if this worked for you or if you should need additional aid.

  • You are most welcome. Be sure to contact us in case you run into any similar problem in future – we will be here to help you!

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