I think, many like me, do almost anything with HTML5, CSS, Javascript, and there are many languages requiring a decent, easy, powerful graphical interface, like Python, PHP, etc. wich could be solved with a Browser like FireFox but not being a browser, just a Mozilla GUI, this is, an application with the DOM, HTML5, Javascript support, so we could create our program interface in the Mozilla GUI, and comunicate with it via POST/GET, or JSON. Easy to create a graphical interface like that for any programing language wich doesn't have it. Imagine a Mozilla GUI which is just a main window. Call it MozillaGUI.exe or whatever, which has a config,ini file with startup page, and more options, just click it and there you go with your local or networl application made in python, or php, or whatever. No Tabs,No Bookmarks, No download, No Menu, nothing, just a window with the DOM, HTML5, CSS, Javascript in it.