.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, ico, gif, jpg, png, html, jpeg, xbm, svg, mfp, eml, mng, pjp, xht, xul, dib, 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

Surf the Internet and access your bookmarks and passwords from all devices.
IncrediMail

IncrediMailMozilla XUL Document

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