.XUL

.XUL file extension

This is the basic program to work with .XUL extension

SeaMonkey

SeaMonkeyMozilla 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: htm, xml, bmp, gif, ico, jpg, png, html, jpeg, xbm, svg, mfp, eml, mng, xht, pjp, dib, xul, jpe, svgz, jfif, xhtml, shtml, pjpeg and xevgenxml

.XUL extension is also supported by the following programs:

Mozilla

MozillaMozilla XUL Document

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

NetscapeMozilla XUL Document

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

FirefoxMozilla XUL Document

Multi-tabbed web browser with bookmark management and private browsing.
IncrediMail

IncrediMailMozilla XUL Document

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