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Remove Fiber.js Script Error Pop-Up from Your PC

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TypeAdware, Browser Hijacker, PUP
Short DescriptionA Windows error appears about a script file “Fiber.js” missing. The homepage of the browser is infected and whenever the user tries to search for something, many advertisements of potentially malicious sites occur. In time, other system errors might show up.
SymptomsThe user may have installed the application without his approval. The used browser gets cluttered with a lot of annoying ads.
Distribution MethodBundling, Freeware installers, Spam emails.
Detection toolDownload Malware Removal Tool, to See If Your System Has Been Affected By Fiber.js

“Fiber.js” is a Potentially Unwanted Program (PUP) that after being installed on your machine changes browser settings, to try to trick the user into installing other malicious programs. It shows a system error and many unwanted advertisements in your browser. The user might be redirected to fake product pages which aim is to generate revenue per every click and download.

Fiber.js – How Did I Get It?

The “Fiber.js” malware usually gets into your system through third-party installers. It can sneak into your computer without your knowledge, by concealing itself in freeware installations and bundled packages. In these packages, additional components for installation are not always disclosed properly, and people get tricked into installing potentially unwanted programs such as this “Fiber.js”. Sometimes that can be avoided by clicking on the “Advanced” or “Custom” option in an installation setup to see what will be installed.

Another way of getting this PUP is by installing it unknowingly as a browser extension for popular browsers like Mozilla Firefox, Google Chrome, Internet Explorer and etc. Also, you can get infected by opening spam emails, which is less common but still effective.

Some users report that got the “fiber.js” error after their browser being infected with the “” hijacker we have written an article about in the past.

Fiber.js – More About It

Once you have been infected with the “Fiber.js” malware, the following Windows Host Error will appear, periodically:


The unwanted application puts files to your hard disk, such as dll files and then it makes a new startup key with the name “Fiber.js” and a value with a randomname.dll. Also, you can find it in one or more folders created by it, like the following examples:

  • C:\ProgramData\{0D2BE5E8-5DA9-346E-EC2F-44EC3CAD9762}\\
  • C:\ProgramData\{101CF8DF-409E-2959-F118-59DB219A8A55}\\
  • C:\ProgramData\{91CA7909-C148-A88F-70CE-D80DA04C0B83}\\
  • C:\ProgramData\{F51D1DDE-A59F-CC58-1419-BCDAC49B6F54}\\

After the infection is spread, it will inject your web browser with a browser extension and will show many annoying advertisements, with pop-ups, banners, underlined keywords in websites. Half of those would be fake coupon discounts for sites you are visiting, trying to redirect you to other sites. The products might be fake toolbars and optimization tools. It might also show fake messages of missing plugins, or a certain player is needed to be installed to continue browsing, a Java or FlashPlayer update. The adware will do that in order to get your system infected further and generate pay-per-click revenue on the visited pages. Having this adware and installing more programs that are being advertised by it, can cause more system errors, browser crashing, and frequent stuttering of your machine.

Remove Fiber.js Completely

To remove “Fiber.js” manually from your computer, be sure to follow the step-by-step removal guide below. In case the manual removal does not get rid of this PUP completely, you should search for and remove the leftover files with an advanced anti-malware program. Installing such a program will also make sure that your system is safe from other, future threats you may come across.

Step 1: Remove/Uninstall Fiber.js in Windows

Here is a method in few easy steps to remove that program. No matter if you are using Windows 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program get left behind, and that can lead to unstable work of your PC, mistakes with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it. To do that:

  • Hold the Windows Logo Button and “R” on your keyboard. A Pop-up window will appear (fig.1).
  • uninstall-virus-fig1

  • In the field type in “appwiz.cpl” and press ENTER (fig.2).
  • uninstall-virus-fig2

  • This will open a window with all the programs installed on the PC.
    Select the program that you want to remove, and press “Uninstall” (fig.3).
  • uninstall-virus-fig3

    Follow the instructions above and you will successfully uninstall Fiber.js.

    Step 2: Remove Fiber.js from your browser

    Remove a toolbar from Mozilla FirefoxRemove a toolbar from Google Chrome Remove a toolbar from Internet Explorer Remove a toolbar from Safari
    Start Mozilla Firefox Open the menu window


    Select the “Add-ons” icon from the menu


    Select Fiber.js and click “Remove


    After Fiber.js is removed, restart Mozilla Firefox by closing it from the red “X” in the top right corner and start it again.

    Start Google Chrome and Open the drop menu


  • Move the cursor over “Tools” and then from the extended menu choose “Extensions
  • uninstall-fig8

  • From the opened “Extensions” menu locate Fiber.js and click on the garbage bin icon on the right of it.
  • uninstall-fig9

  • After Fiber.js is removed, restart Google Chrome by closing it from the red “X” in the top right corner and start it again.
  • Start Internet Explorer:

  • Click “‘Tools’ to open the drop menu and select ‘Manage Add-ons’
  • uninstall-fig10

  • In the ‘Manage Add-ons’ window, make sure that in the first window ‘Add-on Types’, the drop menu ‘Show’ is on ‘All add-ons’
  • uninstall-fig11

    Select Fiber.js to remove, and then click ‘Disable’. A pop-up window will appear to inform you that you are about to disable the selected toolbar, and some additional toolbars might be disabled as well. Leave all the boxes checked, and click ‘Disable’.


    After Fiber.js has been removed, restart Internet Explorer by closing it from the red ‘X’ in the top right corner and start it again.

    Start Safari

    Open the drop menu by clicking on the sprocket icon in the top right corner.

    From the drop menu select ‘Preferences’
    In the new window select ‘Extensions’
    Click once on Fiber.js
    Click ‘Uninstall’


    A pop-up window will appear asking for confirmation to uninstall Fiber.js. Select ‘Uninstall’ again, and the Fiber.js will be removed.

    Step 3: Remove Fiber.js automatically by downloading an advanced anti-malware program.

    To clean your computer you should download an updated anti-malware program on a safe PC and then install it on the affected computer in offline mode. After that you should boot into safe mode and scan your computer to remove all Fiber.js associated objects.

    NOTE! Substantial notification about the Fiber.js threat: Manual removal of Fiber.js requires interference with system files and registries. Thus, it can cause damage to your PC. Even if your computer skills are not at a professional level, don’t worry. You can do the removal yourself just in 5 minutes, using a malware removal tool.

    Berta Bilbao

    Berta is a dedicated malware researcher, dreaming for a more secure cyber space. Her fascination with IT security began a few years ago when a malware locked her out of her own computer.

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    1. AvatarMrDrone

      To get rid of the annoying pop-up, I just created an empty text document in the folder that the message refers to, and renamed it “fiber.js”.

      wa-la, no more pop-up.


      1. AvatarVencislav Krustev

        Good for providing a suggestion, i think some users will find it very helpful. Thanks.


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