in order to do a embedded Geoke project, I found XUL and XULRunner

XULRunner is only around 5M at this moment and very easy to use ...

XULRunner is a Mozilla runtime package that can be used to bootstrap XUL+XPCOM applications that are as rich as Firefox and Thunderbird. It will provide mechanisms for installing, upgrading, and uninstalling these applications. XULRunner will also provide libxul, a solution which allows the embedding of Mozilla technologies in other projects and products.

Deploying XULRunner 1.8
XULRunner 1.8 is a stable developer preview release; here's how it can be used to deploy standalone XUL applications in a production environment.

Enabling Password Manager

These preferences seem to be the default in Firefox, however, they are missing in XULRunner. Without these settings Password Manager will not store login details.

pref("signon.rememberSignons", true);
pref("signon.expireMasterPassword", false);
pref("signon.SignonFileName", "signons.txt");