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What is browser-test.info?

The Malwarebytes research team has determined that browser-test.info is a forced Firefox extension. The extensions that belong to this family are capable of downloading code after the installation to perform several functions:

  • search hijackers
  • crypto-currency miners
  • adware
  • ad-fraud

How do I know if my computer is affected by browser-test.info?

You may see this prompt to keep visitors trapped on the site:


and these warnings during install:




After install you may see this entry in your list of installed Firefox extensions:


This extension has no display-name and no visible icon.

How did browser-test.info get on my computer?
Forced extensions use typical methods for distributing themselves.
They try to keep users trapped until they agree to install the extension.


How do I remove browser-test.info?

Our program Malwarebytes can detect and remove this unwanted program.

  • Please download Malwarebytes to your desktop.
  • Double-click mb3-setup-consumer-{version}.exe and follow the prompts to install the program.
  • Then click Finish.
  • Once the program has fully updated, select Scan Now on the Dashboard. Or select the Threat Scan from the Scan menu.
  • If another update of the definitions is available, it will be implemented before the rest of the scanning procedure.
  • When the scan is complete, make sure that all Threats are selected, and click Remove Selected.
  • Restart your computer when prompted to do so.

Is there anything else I need to do to get rid of browser-test.info?

  • No, Malwarebytes removes browser-test.info completely.

How would the full version of Malwarebytes help protect me?

We hope our application and this guide have helped you eradicate this forced extension.

We protect our customers from these extensions by blocking the sites that spread them and the domains they contact for additional code. Malwarebytes Browser Extension users were protected even before we added the domains to the blocklist:


Technical details for experts

Possible signs in FRST logs:

FF Extension: No Name - C:\Users\{username}\AppData\Roaming\Mozilla\Firefox\Profiles\{profile}.default\Extensions\{12e75094-10b0-497b-92af-5405c053c73b}.xpi [2018-10-23]

Alterations made by the installer:

File system details [View: All details] (Selection)
    Adds the folder C:\Users\{username}\AppData\Roaming\Mozilla\Firefox\Profiles\{profile}.default\browser-extension-data\{12e75094-10b0-497b-92af-5405c053c73b}
       Adds the file storage.js"="10/23/2018 10:46 AM, 444 bytes, A
    In the existing folder C:\Users\{username}\AppData\Roaming\Mozilla\Firefox\Profiles\{profile}.default\extensions
       Adds the file {12e75094-10b0-497b-92af-5405c053c73b}.xpi"="10/23/2018 10:46 AM, 83981 bytes, A

Malwarebytes log:


-Log Details-
Scan Date: 10/23/18
Scan Time: 9:21 AM
Log File: 4987ea9f-d694-11e8-ba93-00ffdcc6fdfc.json

-Software Information-
Components Version: 1.0.463
Update Package Version: 1.0.7479
License: Premium

-System Information-
OS: Windows 7 Service Pack 1
CPU: x64
File System: NTFS
User: {computername}\{username}

-Scan Summary-
Scan Type: Threat Scan
Scan Initiated By: Manual
Result: Completed
Objects Scanned: 238213
Threats Detected: 3
Threats Quarantined: 3
Time Elapsed: 2 min, 48 sec

-Scan Options-
Memory: Enabled
Startup: Enabled
Filesystem: Enabled
Archives: Enabled
Rootkits: Enabled
Heuristics: Enabled
PUP: Detect
PUM: Detect

-Scan Details-
Process: 0
(No malicious items detected)

Module: 0
(No malicious items detected)

Registry Key: 0
(No malicious items detected)

Registry Value: 0
(No malicious items detected)

Registry Data: 0
(No malicious items detected)

Data Stream: 0
(No malicious items detected)

Folder: 1
PUP.Optional.ForcedInstalledExtensionFF.Generic, C:\USERS\{username}\APPDATA\ROAMING\MOZILLA\FIREFOX\PROFILES\{profile}.default\BROWSER-EXTENSION-DATA\{12E75094-10B0-497B-92AF-5405C053C73B}, Quarantined, [14207], [576273],1.0.7479

File: 2
PUP.Optional.ForcedInstalledExtensionFF, C:\USERS\{username}\APPDATA\ROAMING\MOZILLA\FIREFOX\PROFILES\{profile}.default\EXTENSIONS\{12E75094-10B0-497B-92AF-5405C053C73B}.XPI, Quarantined, [1707], [576270],1.0.7479
PUP.Optional.ForcedInstalledExtensionFF.Generic, C:\USERS\{username}\APPDATA\ROAMING\MOZILLA\FIREFOX\PROFILES\{profile}.default\BROWSER-EXTENSION-DATA\{12E75094-10B0-497B-92AF-5405C053C73B}\STORAGE.JS, Quarantined, [14207], [576273],1.0.7479

Physical Sector: 0
(No malicious items detected)

WMI: 0
(No malicious items detected)


As mentioned before the full version of Malwarebytes could have protected your computer against this threat.
We use different ways of protecting your computer(s):

  • Dynamically Blocks Malware Sites & Servers
  • Malware Execution Prevention

Save yourself the hassle and get protected. 

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