The File Extensions Database

.XUL File Extension

  • Developer by: Mozilla
  • Category: Web Files
  • Format: XML

What is an .XUL file?

.XUL is XML User Interface Language File

Self-contained application or Firefox extension written in XML; supported by Mozilla browsers and other Web browsers that are based on the Gecko engine.

Programs that open XML User Interface Language File
Mozilla Firefox
Mozilla SeaMonkey
Mozilla Firefox
Mozilla SeaMonkey
Mozilla Firefox
Mozilla SeaMonkey

How to solve problems with XUL files

  • Associate the XUL file extension with the correct application. On :
    Windows: Right click on any XUL file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.XUL files". Mac: Right click (or Ctrl-click) the XUL file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .XUL is XML User Interface Language File. Because only the current version supports the latest XUL file format. Search, therefore, e.g. on the Mozilla manufacturer website after an available .XUL is XML User Interface Language File update.
  • To make sure that your XUL file is not corrupted or virus-infected, get the file again and scan it with antivirus software.