How to open .XUL file extension?

If you cannot open a new file that has been saved in the .XUL format you need to download the appropriate software. The manufacturer of .XUL files is Mozilla; .XUL files belong to the Web Files category. After downloading the application from the list available on our website just run an unknown file, and as the default set the newly installed application supporting the .XUL files. Activities performed in the order described should solve the problems with all the files in the .XUL format.

• What is .XUL file?
• How to open .XUL file?
• What is .XUL file?