Opening XUL files
Did your computer fail to open a XUL file? We explain what XUL files are and recommend software that we know can open or convert your XUL files.
What is a XUL file?
Files with the .xul extension are most commonly associated with the Mozilla Firefox Internet browser. The XUL files are XML user interface files. The XUL file format was created to make it easier to develop the Mozilla Firefox browser. Other Web browser that are based on the Gecko engine also use the XUL file format.
Software that will open, convert or fix XUL files
Try a universal file viewer
In addition to the products listed above, I would suggest that you try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and very likely yours too! Download Free File Viewer.