Switch between several accounts to login to any website

[Contro]

I am interest in this web : http://www.vulka.es/home.php

I have or manage several accounts there.

I am thinking about something similar to fbQuickLogin that allows to login to up ten profiles. It's easy to switch from one account to another. But only serves for Facebook.

I think this type of tools must exist because of needs of community managers, by example. Or multisectorial announces in a professional directory website.

The multi-login accounts addon for Chrome seems oriented to the simultaneous login, but only gives new tabs where you have to manually login (i think....)

Do you know any good tool for this ?

Best Regards