I see a new problem and I'm not sure when it was introduced. I think
it's better to fix this one, then I can continue evaluating the whole.
Here is the scenario (tested in FF 4.0.1 / Vista)
1. Click Databases
2. For a database, click Check Privileges
3. Click Add a new user
4. Fill minimum values in the popup (a name, generate password) and
create the user
5. User gets created but Firebug tells me that there was a JSON parse
error; the list of privileges for this db does not show up (I think I
saw it in previous tests)