What about using Prism/Webrunner, rather than XULrunner or a customized profile? http://labs.mozilla.com/2007/10/prism/
It creates a quick single-window webbrowser, with system integration for icons, system tray, etc. You can ship the customizations such as number of connections in the included use.js equivalent. The intention is to write custom controls in html, rather than using XUL versions.
