This is an extension that allows Abrowser use KDE's KWallet password manager to store passwords.
Abrowser stores its passwords internaly, optionally protected by a master password. KDE has its own password manager called KWallet. KWallet stores every password in the KDE system, and protects access by a master password. With this extension you are able to use KWallet instead of the default Abrowser password manager. It allows tighter integration of Abrowser inside KDE.
If you experience SEGFAULTs, it may be due to a bug in Mozilla's new JIT compiler. Try disabling it by setting javascript.options.baselinejit.* in about:config to false.