What is xulrunner.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the xulrunner.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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Xulrunner.exe file information

The process known as xulrunner.exe belongs to software XULRunner or Songbird by Mozilla Foundation (

Description: Xulrunner.exe is not essential for the Windows OS and causes relatively few problems. Xulrunner.exe is located in a subfolder of the user's profile folder. The file size on Windows 10/8/7/XP is 89,600 bytes. 
There is no information about the author of the file. The program is not visible. It is not a Windows core file. Therefore the technical security rating is 55% dangerous, however you should also read the user reviews.

Recommended: Identify xulrunner.exe related errors

If xulrunner.exe is located in a subfolder of "C:\Program Files", the security rating is 64% dangerous. The file size is 1,126,400 bytes. There is no information about the author of the file. The program is not visible. The application uses ports to connect to or from a LAN or the Internet. The file is not a Windows core file.

Uninstalling this variant: If you are having problems with xulrunner.exe, you can also uninstall the software Songbird using the Uninstall a Program function of Windows Control Panel (Windows: Start, Settings, Control Panel, Uninstall a Program).

Important: Some malware camouflages itself as xulrunner.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the xulrunner.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Xulrunner.exe ist auch Bestandteil des Prototyping tools "Pencil Project" von Evolus Solutions Ltd. und befindet sich deshalb im Installtationsverzeichnis von Pencil. Für die Ausführung von Pencil offenbar notwendig und bisher keine negativen Erfahrungen, daher die Bewertung
  R. Jansmann   (further information)

Summary: Average user rating of xulrunner.exe: based on 1 vote with 1 user comment. One user thinks xulrunner.exe is essential for Windows or an installed application.

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Best practices for resolving xulrunner issues

A clean and tidy computer is the key requirement for avoiding problems with xulrunner. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the xulrunner.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

xulrunner.exe [all]