.XUL

.XUL file extension

This is the basic program to work with .XUL extension

SeaMonkey

SeaMonkey Mozilla XUL Document

The SeaMonkey project is a community effort to develop the SeaMonkey all-in-one internet application suite. Such a software suite was previously made popular by Netscape and Mozilla, and the SeaMonkey project continues to develop and deliver high-quality updates to this concept... (more)

The program works with the following extensions: bmp, ico, gif, jpg, png, htm, xml, jpeg, html, pjp, xht, xul, dib, jpe, xbm, svg, mfp, eml, mng, jfif, svgz, pjpeg, xhtml, shtml and xevgenxml

.XUL extension is also supported by the following programs:

Mozilla

Mozilla Mozilla XUL Document

Firefox is now easier to update with one less prompt.
Netscape

Netscape Mozilla XUL Document

Netscape 6 (formerly Netscape Communicator) is the first Internet software to seamlessly integrate b...
Firefox

Firefox Mozilla XUL Document

Popular web browser with all the features one might ever need.
IncrediMail

IncrediMail Mozilla XUL Document

It is an e-mail client program designed for replacing your regular e-mail app.