Severity scale:  
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Remove Tampermonkey (Removal Instructions) - updated Aug 2019

removal by Jake Doevan - - | Type: Browser Plugins

Tampermonkey is a Google Chrome and other browser extension that helps users modify the functionality of the visited site

Tampermonkey

Tampermonkey is a userscript managing application that is usually downloaded intentionally for Chrome, MS Edge, Firefox, Safari, and Opera web browsers. The extension is widely popular, residing in more than 10 million users computers due to its useful functionality – it allows modification of certain visited website function modifications which would otherwise be unavailable.

Tampermonkey allows users to choose from more than 400,000 different JavaScript[1] scripts that each is used for different functions. For example, “Auto Close YouTube Ads” script allows the automatic closure of the ad as soon as the “Skip ad” option becomes available, while “Anti-Adblock Killer” prevents websites from blocking the feature. This is how Tampermonkey add-on can make the online experience of many users much more efficient – it provides many customization options.

However, like many browser extensions, Tampermonkey is not without the problems. First of all, while the application is itself safe, it might, potentially, load unsafe scripts from unknown sources. Loading outside scripts might be just as dangerous as downloading an executable from Torrent sites. Besides, some users complained about Tampermonkey removal and self-reinstallation problems.

Name Tampermonkey
Type Browser extension
Developed by Jan Biniok
Purpose Allows users to load additional scripts that changes the functionality of various websites
Distribution Official sources, third-party sites
Potential dangers Downloading and installing malicious scripts for the app that could result in malware infection and unwanted browser behavior
Fix If you experience any suspicious behavior like reinstallation of the app, scan the system using Reimage or another security software

While Tampermonkey is a useful app with plenty of customization options, it might sometimes not be safe. However, it all depends on how users use it, as loading malicious scripts without realizing it is also a possibility. Malicious scripts can abuse the vulnerabilities of the web browsers, installed programs, or the operating system. For that reason, malware[2] installation might be performed automatically, without user consent.

Most of such JavaScripts are embedded on hacked or malicious websites. Unfortunately, scripts for Tampermonkey might be hosted on malicious sites that users might download intentionally, thinking it is legitimate. Therefore, the reckless behavior can indeed lead to malware.

Please pay attention to the description of what Tampermonkey app can do:

Add “Tampermonkey”?

It can:

Read and change all your data on the websites you visit

Display notifications

Modify data you copy and paste

Manage your apps, extensions, and themes

If you combine these permissions with a malicious script that you might have downloaded, the consequences might be devastating.

Tampermonkey add-on
Tampermonkey is an add-on that helps users manage scripts for various sites. Unfortunately, not all of the downloaded scripts might be safe, resulting in suspicious app behavior

To make sure that your computer is safe, we recommend scanning it with anti-malware software like Reimage or SpyHunter 5Combo Cleaner, especially if you noticed strange browser behavior – redirects, excessive ads, extensions installed without your consent, or overall slowness of the computer operation.

Another problem that prompted users to call the extension “Tampermonkey virus” is its reinstallation problems. Several users claimed that even after getting rid of the application, it gets reinstalled as soon as the browser is restarted.[3] Some also stated that after such installation, they were unable to remove Tampermonkey, as the option was missing entirely.

To get rid of Tampermonkey, you should check our guidelines below. In the worst-case scenario, the reinstallation of the browser might be required.

Potentially unwanted software come without users' knowledge

Automatic (re)installation of browser extensions might not necessarily be related to the extensions themselves, but rather with installed potentially unwanted programs[4] on the machine. In most of the cases, such unwanted apps like adware come bundled with freeware or shareware.

These free programs are usually hosted on third-party sites. While there is nothing illegal about offering several applications via the installer, some of these optional components might be ad-sponsored and even malicious. Therefore, it is especially important to make sure the installation process of new applications is performed as carefully as possible. Here are some experts' tips[5] on the matter:

  • Before installing the app, check out its reviews online – they can often hint if the program is shady;
  • Choose reliable sources for your downloads. While all third-party sites bundle software, they do perform security checks before offering them;
  • During the installation process, decline all deals/offers;
  • Check for fine print and pre-ticked boxes;
  • When prompted, always opt for Advanced/Custom settings.

Terminate suspicious processes and uninstall Tampermonkey

In some cases, Tampermonkey removal might be hindered by another malicious application that is installed on your machine – that is when the suspicious reinstallation cycle might be observed by users. In such a case, it is vital to locate and terminate all the PUPs and malware that might be hiding on your machine.

Tampermonkey installed by another program
In some cases, users might install malicious scripts for Tampermonkey. This results in automatic reinstallation and removal problems of the app

You should first check the installed program list via the Programs and Features (Windows) or Applications (Mac) folders and uninstall everything suspicious. Then, make sure you reset each of the installed browsers – the action is mandatory to prevent altered settings from returning the unwanted activity of the PUP. Finally, you should scan your machine with anti-malware software to make sure your computer is secure.

In some cases, all these actions might be not enough to remove Tampermonkey. The underlying reason might be modified registry or other vital operating system parts. In such a case, experts recommend reinstalling the browser altogether and then performing a repeated security scan.

You can remove virus damage automatically with a help of one of these programs: Reimage, SpyHunter 5Combo Cleaner, Malwarebytes. We recommend these applications because they detect potentially unwanted programs and viruses with all their files and registry entries that are related to them.

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What to do if failed?
If you failed to remove virus damage using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to remove virus damage. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.
Alternative Software
Different security software includes different virus database. If you didn’t succeed in finding malware with Reimage, try running alternative scan with SpyHunter 5.
Alternative Software
Different security software includes different virus database. If you didn’t succeed in finding malware with Reimage, try running alternative scan with Combo Cleaner.

To remove Tampermonkey, follow these steps:

Delete Tampermonkey from Windows systems

You can eliminate Tampermonkey from the device with this guide:

  1. Click Start Control Panel Programs and Features (if you are Windows XP user, click on Add/Remove Programs). Click 'Start -> Control Panel -> Programs and Features' (if you are 'Windows XP' user, click on 'Add/Remove Programs').
  2. If you are Windows 10 / Windows 8 user, then right-click in the lower left corner of the screen. Once Quick Access Menu shows up, select Control Panel and Uninstall a Program. If you are 'Windows 10 / Windows 8' user, then right-click in the lower left corner of the screen. Once 'Quick Access Menu' shows up, select 'Control Panel' and 'Uninstall a Program'.
  3. Uninstall Tampermonkey and related programs
    Here, look for Tampermonkey or any other recently installed suspicious programs.
  4. Uninstall them and click OK to save these changes. Right click on each of suspicious entries and select 'Uninstall'

Erase Tampermonkey from Mac OS X system

  1. If you are using OS X, click Go button at the top left of the screen and select Applications. Cick 'Go' and select 'Applications'
  2. Wait until you see Applications folder and look for Tampermonkey or any other suspicious programs on it. Now right click on every of such entries and select Move to Trash. Click on every malicious entry and select 'Move to Trash'

Uninstall Tampermonkey from Internet Explorer (IE)

  1. Remove dangerous add-ons
    Open Internet Explorer, click on the Gear icon (IE menu) on the top right corner of the browser and choose Manage Add-ons. Click on menu icon and select 'Manage add-ons'
  2. You will see a Manage Add-ons window. Here, look for Tampermonkey and other suspicious plugins. Disable these entries by clicking Disable: Right click on each of malicious entries and select 'Disable'
  3. Change your homepage if it was altered by virus:
    Click on the gear icon (menu) on the top right corner of the browser and select Internet Options. Stay in General tab.
  4. Here, remove malicious URL and enter preferable domain name. Click Apply to save changes. Delete malicious URL, enter your desired domain name and click 'Apply' to save changes
  5. Reset Internet Explorer
    Click on the gear icon (menu) again and select Internet options. Go to Advanced tab.
  6. Here, select Reset.
  7. When in the new window, check Delete personal settings and select Reset again to complete Tampermonkey removal. Go to 'Advanced' tab and click on 'Reset' button. Now select 'Delete personal settings' and click on 'Reset' button again

Eliminate Tampermonkey from Microsoft Edge

Reset Microsoft Edge settings (Method 1):

  1. Launch Microsoft Edge app and click More (three dots at the top right corner of the screen).
  2. Click Settings to open more options.
  3. Once Settings window shows up, click Choose what to clear button under Clear browsing data option. Go to Settings and select 'Choose what to clear'
  4. Here, select all what you want to remove and click Clear. Select 'Clear' button
  5. Now you should right-click on the Start button (Windows logo). Here, select Task Manager. Open the start menu and select 'Task Manager'
  6. When in Processes tab, search for Microsoft Edge.
  7. Right-click on it and choose Go to details option. If can’t see Go to details option, click More details and repeat previous steps. Right-click 'Microsoft Edge' and select 'Go to details' Select 'More details' if 'Go to details' option fails to show up
  8. When Details tab shows up, find every entry with Microsoft Edge name in it. Right click on each of them and select End Task to end these entries. Find Microsoft Edge entries and select 'End Task'

Resetting Microsoft Edge browser (Method 2):

If Method 1 failed to help you, you need to use an advanced Edge reset method.

  1. Note: you need to backup your data before using this method.
  2. Find this folder on your computer: C:\Users\%username%\AppData\Local\Packages\Microsoft.MicrosoftEdge_8wekyb3d8bbwe.
  3. Select every entry which is saved on it and right click with your mouse. Then Delete option. Go to Microsoft Edge folder on your computer, right-click every entry and click 'Delete'
  4. Click the Start button (Windows logo) and type in window power in Search my stuff line.
  5. Right-click the Windows PowerShell entry and choose Run as administrator. Find Windows PowerShell, right-click it and select 'Run as administrator'
  6. Once Administrator: Windows PowerShell window shows up, paste this command line after PS C:\WINDOWS\system32> and press Enter:
    Get-AppXPackage -AllUsers -Name Microsoft.MicrosoftEdge | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register $($_.InstallLocation)\AppXManifest.xml -Verbose}
    Copy and paste a required command and press 'Enter'

Once these steps are finished, Tampermonkey should be removed from your Microsoft Edge browser.

Get rid of Tampermonkey from Mozilla Firefox (FF)

Don't forget to clean the browser after Tampermonkey uninstallation:

  1. Remove dangerous extensions
    Open Mozilla Firefox, click on the menu icon (top right corner) and select Add-ons Extensions. Click on menu icon and select 'Add-ons'
  2. Here, select Tampermonkey and other questionable plugins. Click Remove to delete these entries. Select 'Extensions' and look for malicious entries. Click 'Remove' to get rid of each of them
  3. Reset Mozilla Firefox
    Click on the Firefox menu on the top left and click on the question mark. Here, choose Troubleshooting Information. Click on menu icon and then on '?'. Select 'Troubleshooting Information'
  4. Now you will see Reset Firefox to its default state message with Reset Firefox button. Click this button for several times and complete Tampermonkey removal. Click on 'Reset Firefox' button for a couple of times

Remove Tampermonkey from Google Chrome

Change settings to default on your Chrome, to make sure it normally works:

  1. Delete malicious plugins
    Open Google Chrome, click on the menu icon (top right corner) and select Tools Extensions. Click on menu icon. Select 'Tools' and 'Extensions'
  2. Here, select Tampermonkey and other malicious plugins and select trash icon to delete these entries. Look for malicious entries and delete each of them by clicking on the Trash bin icon
  3. Click on menu icon again and choose Settings Manage Search engines under the Search section. When in 'Settings', select 'Manage search engines...'
  4. When in Search Engines..., remove malicious search sites. You should leave only Google or your preferred domain name. Click 'X' to remove malicious URLs
  5. Reset Google Chrome
    Click on menu icon on the top right of your Google Chrome and select Settings.
  6. Scroll down to the end of the page and click on Reset browser settings. When in 'Settings', scroll down to 'Reset browser settings' button and click on it
  7. Click Reset to confirm this action and complete Tampermonkey removal. Click on 'Reset' button to complete your removal

Delete Tampermonkey from Safari

  1. Remove dangerous extensions
    Open Safari web browser and click on Safari in menu at the top left of the screen. Once you do this, select Preferences. Click on 'Safari' and select 'Preferences'
  2. Here, select Extensions and look for Tampermonkey or other suspicious entries. Click on the Uninstall button to get rid each of them. Go to 'Extensions' and uninstall malicious add-ons
  3. Reset Safari
    Open Safari browser and click on Safari in menu section at the top left of the screen. Here, select Reset Safari.... Click on 'Safari' and select 'Reset Safari...'
  4. Now you will see a detailed dialog window filled with reset options. All of those options are usually checked, but you can specify which of them you want to reset. Click the Reset button to complete Tampermonkey removal process. Select all options and click on 'Reset' button

About the author

Jake Doevan
Jake Doevan - Computer technology expert

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