Guitmestra Mac


Guitmestra is a program that is capable of rerouting user searches, displaying intrusive adverts and making changes to the main Mac browser. Due to these activities, It falls into the category of browser hijackers. The main feature of this program is the creation of endless ads on your screen. That’s why, as soon as you get Guitmestra installed inside your Safari, Chrome, Mozilla or other web browsers, you are likely to start seeing all sorts of pop-ups, banner ads, and more similar commercial messages.In addition to that, it may happen that, as soon as you open a new tab or start a new search, you may experience auto-redirects to pages that you never wanted to land on. Another common thing that may happen is, your browser’s homepage URL and/or your main search engine may get replaced with some new ones that you never approved of.

The Guitmestra Mac virus will redirect you to various unrelated wesites

Changes may take place also in the way your browser’s toolbar looks – new add-ons and buttons may appear without your consent. The good news is that these changes can be safely uninstalled and once you do that, the ads that constantly interrupt your web browsing activity will also be gone. The removal guide below contains all the instructions that you’ll need, plus a professional auto-removal tool for a full system check.

Guitmestra for Mac

Guitmestra for Mac is a program that web users classify as potentially unwanted. This is because Guitmestra for Mac has the ability to modify different components of the main browser and force it to redirect to pages with sponsored content. These page redirects and the random ads, pop-up notifications, and banners that may accompany them can become quite annoying in a very short period of time. More so, if they are happening on a device owned by your company. In this case, you may find yourself losing precious time in trying to remove and close down various nagging messages from your screen. Besides, the interaction with all these unfamiliar links and pop-up notifications like Imklaunchagent can hide serious security risks such as clicking on a malicious web link or being redirected to a phishing page or a site that contains viruses as nasty as the infamous Ransomware.

What is Guitmestra?

Guitmestra is a browser hijacking program that can take control of your Mac browser and make it operate in a certain way. Guitmestra will attempt to make you click on various web links, ads, and pop-up notifications during your web browsing sessions. More often than not, such software will attempt to make you buy something, for instance, different physical products or some software applications with promising features. However, in certain cases you may be tricked to download even viruses and malware like Trojans or Ransomware which you certainly do not need. That is why it is generally a good idea to try to keep away from any shady web links and offers and remove them from your screen.

The app is a potentially unwanted application that is not intended to harm your Mac computer. However, the app can certainly create some disturbance to your web browsing activity by spamming you with unnecessary ads. You can uninstall it manually or automatically. The removal guide below explains the manual steps but if you prefer to handle the browser hijacker with a professional program, feel free to use the tool that we have listed there.


TypeBrowser Hijacker
Danger LevelMedium (nowhere near threats like Ransomware, but still a security risk)
SymptomsUsers who have a Browser Hijacker on their system may constantly experience auto-redirects to random web locations.
Distribution MethodBrowser Hijackers get often distributed via program bundling methods or inside torrents and spam messages.
Detection Tool

Remove Guitmestra from Mac

For a quick way to remove Guitmestra try to do this inside your Mac browser:

  1. Open your Mac browser.
  2. Go to Preferences.
  3. Now navigate to the extensions sub-menu.
  4. Look for any unfamiliar entries, including Guitmestra.
  5. Remove Guitmestra from your Mac as well as any other suspicious-looking items by clicking on the trash bin icon.

If this does not help then continue reading this article for more detailed instructions on how to get rid of Guitmestra!


The first thing you need to do is to Quit Safari (if it is opened). If you have trouble closing it normally, you may need to Force Quit Safari:

You can choose the Apple menu and click on Force Quit.

Alternatively, you can simultaneously press (the Command key situated next to the space bar), Option (the key right next to it) and Escape (the key located at the upper left corner of your keyboard).

If you have done it right a dialog box titled Force Quit Applications will open up.

In this new dialog window select Safari, then press the Force Quit button, then confirm with Force Quit again.

Close the dialog box/window.



Start Activity Monitor by opening up Finder, then proceed to

Once there, look at all the processes: if you believe any of them are hijacking your results, or are part of the problem, highlight the process with your mouse, then click the “i” button at the top. This will open up the following box:


Now click on Sample at the bottom:


Do this for all processes you believe are part of the threat, and run any suspicious files in our online virus scanner, then delete the malicious files:

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    The next step is to safely launch Safari again. Press and hold the Shift key while relaunching Safari. This will prevent Safari’s previously opened pages from loading again. Once Safari is opened up, you can release the Shift key.

    On the off chance that you are still having trouble with scripts interrupting the closing of unwanted pages in Safari, you may need to take some additional measures.

    First, Force Quit Safari again.

    Now if you are using a Wi-Fi connection turn it off by selecting Wi-Fi off in you Mac’s Menu. If you are using a cable internet (Ethernet connection), disconnect the Ethernet cable.


    Re-Launch Safari but don’t forget to press and hold the Shift button while doing it, so no previous pages can be opened up. Now, Click on Preferences in the Safari menu,

    Preferences in Safari

    and then again on the Extensions tab,

    extensions in safari

    Select and Uninstall any extensions that you don’t recognize by clicking on the Uninstall button. If you are not sure and don’t want to take any risks you can safely uninstall all extensions, none are required for normal system operation.

    The threat has likely infected all of your browsers. The instructions below need to be applied for all browsers you are using.

    Again select Preferences in the Safari Menu, but this time click on the Privacy tab,
    Privacy in Safari

    Now click on Remove All Website Data, confirm with Remove Now. Keep in mind that after you do this all stored website data will be deleted. You will need to sign-in again for all websites that require any form of authentication.

    Still in the Preferences menu, hit the General tab

    General Tab in Safari

    Check if your Homepage is the one you have selected, if not change it to whatever you prefer.
    Default Home Page

    Select the History menu this time, and click on Clear History. This way you will prevent accidentally opening a problematic web page again.

     How to Remove Guitmestra From Firefox in OSX:

    Open Firefoxclick on mozilla menu (top right) ——-> Add-onsHit Extensions next.

    pic 6

    The problem should be lurking somewhere around here –  Remove it. Then Refresh Your Firefox Settings.

    How to Remove Guitmestra From Chrome in OSX:

     Start Chrome, click chrome menu icon —–>More Tools —–> Extensions. There,  find the malware and  select  chrome-trash-icon.

    pic 8

     Click chrome menu icon again, and proceed to Settings —> Search, the fourth tab, select Manage Search Engines.  Delete everything but the search engines you normally use. After that Reset Your Chrome Settings.

    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.

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