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What is Mac File Opener? “Malware” Removal (March 2019 Update)

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This page aims to help you remove Mac File Opener “Malware”. Our removal instructions work for Safari, Chrome and Firefox, as well as every version of Mac.

It is really irritating to have your browser filled with obnoxious ads that seem to pop-up every time you try to open an new browsing session or visit a certain site. It is even more unpleasant if you are getting randomly redirected to different sponsored pages and if different elements of your browser such as its starting page and search engine have been altered without your agreement and permission. Sadly, there are thousands of software components out there that have been created precisely with that same purpose – to fill your browser (Safari, Opera, Firefox, Chrome or any other) with irritating advertising content and to make alterations to it that would further facilitate the promotional campaigns conducted by the undesirable software. Normally, most security researchers refer to apps that are capable of doing this as browser hijackers and here we will tell you more about one such hijacker application – Mac File Opener.

Mac File Opener “Malware”

Mac File Opener, similarly to most other apps that belong to this software category, is able to introduce changes to your browser without asking for your permission and also to spam it with all kinds of obstructive online ads – box messages, blinking banners, pop-ups, page redirects, pop-unders and so on. Such activity is not only particularly unpleasant but it could also lead to a number of security risks. For instance, some of the many ads streamed to your screen by the hijacker might be coming from advertising networks with shady reputation. As you probably know, online ads are a favourite tool that many hackers use to distribute malware viruses the likes of Trojans, Ransomware, Spyware, Rootkits and so on. Oftentimes a single click on the wrong ad can lead to the infection of your PC with some insidious and highly dangerous threat like the ones mentioned above. Of course, this doesn’t mean that all of the ads coming from Mac File Opener will be fake or dangerous but you can never be too safe which is why it’s best if you take the necessary actions and eliminate the hijacker in order to prevent it from streaming potentially hazardous ads on your screen. The bad news here is that it might be a bit tricky to successfully uninstall the pesky Mac File Opener and get rid of all of its data. The good news is that we can help you achieve that yourself without the need to take your PC to a professional. Just follow the instructions provided down below in our removal guide and you should have no problem eliminating the pesky app. Still, in case the guide wasn’t enough to liberate your PC from the hijacker or if you don’t feel confident enough to execute all the manual steps, you can resort to the recommended anti-malware tool that is available in the guide and use it to automatically remove the hijacker.

Mac File Opener “Malware” Removal


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 activity-monitor

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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Maximum file size: 128MB.

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Virus Scanner Result


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.

firefox-512 How to Remove Mac File Opener 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.

chrome-logo-transparent-backgroundHow to Remove Mac File Opener 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.

More information regarding Browser Hijackers

There is a popular misconception that browser hijacker apps are dangerous viruses similar to Trojan Horses, Ransomware and Spyware. Sure, there are certain similarities between hijackers and real virus programs but we need to say that most hijacker applications aren’t actually dangerous on their own. Of course, some of their ads might be hazardous but the hijacker itself will likely not try to cause any harm to your system or to the data which is kept on it. Generally speaking, browser hijackers’ main purpose is to accumulate income through the advertising materials that they generate inside the users’ browsers. This is precisely why those apps tend to be so irritating and why their advertising campaigns are usually quite aggressive and unpleasant. Still, as soon as the unwanted app is taken away, your computer should be back to normal and there shouldn’t be any lasting damage done to it. Some users might notice a slowdown in their computer’s productivity while the hijacker is on it but this would go away as soon as the undesirable app is uninstalled.

The installation of a hijacker

Mac File Opener and most other apps of its kind typically get distributed via methods such as spam campaigns, malvertising and file bundling. The file bundling method seems to be particularly effective since most users forget to customize the installation of new programs and if there’s something bundled with the installer (like a hijacker), they would get that installed on their PC by default. There, however is an easy way to avoid that while still getting the main program. Just take a loot at the setup menu and see if there are any clauses that allow the installation of bundled apps and if there are any such clauses, uncheck them. Make sure to use the Custom setup menu if there is one such available because sometimes this is where the options regarding the bundled apps are available.


Name Mac File Opener
Type Browser Hijacker
Danger Level Medium (nowhere near threats like Ransomware, but still a security risk)
Symptoms  Some of the typical symptoms are spam of online ads and unwanted browser changes.
Distribution Method Common distribution techniques are spam messages, file bundles, torrents, ads, pirated content and so on.
Detection Tool

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!

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