[akanevsky]

This hack has poor code for the following reasons:
- It does not treat strings as strings, rather as constants. PHP, however, will only show an error if there is an E_NOTICE error reporting turned on.
- It is completely unnecessary to alter user table and save browser informations.
- Addslashes() is deprected in vbulletin 3.5. Use $db->escape_string() instead.
- There is no point in the "unknown" value. That value will just take up db space. Why not make a default empty string which will return false when accessed. E.g. you can change <if condition="$loggedin[browser] == unknown"> to <if condition="!$loggedin[browser]"> if you do that.

That said, I like the idea. Only, I think I've seen the same thing released a couple of days ago. Maybe I have hallucations, Idk