Recently, an exploit has been found out that allows people to use their cookies to gain access to the ACP. And Firefox assists with it !Basically what happens that is when you visitthe phpBB forum, it logs a cookie containing your Session ID (Basically who and when you are). What it does, after much decoding and encoding, is allows you to replace your SID with the admin's, thus enabling them to gain access. To fix this, upgrade to the latest version of phpBB, 2.0.13.Dun dun dunnnnn! Beware