Hi there.
I actually don't want to interfere with any problems, but what this member says is possible.
I'm not a member of xray-email (not yet at least

planning to become one) but many others who have timers and only allow one link to be clicked at a time.
Most of those clicks have 10 or 15 second timers.
But when there is only 7-8 second left on the timer, you can already click a new ad, the old timer will still count further, and the new timer will start to count, and both ads will be credited.
I think this is some kind of bug or anything in CC, since I see it on every site where I'm a member of who only allow 1 click at a time. And I use firefox too. Maybe it's some kind of firefox - CC problem. Don't know how it reacts in IE, don't use IE.
Again, I don't want to tell you how you should run your program, but it is possible to click them faster then the timer expires without using cheat tools.