Miky, Senyoru, it's not like you could cheat and not realize you're doing it.
If you just play fair, you're at no risk of getting banned. This is just for people who abuse of the system by using other programs/sites/scripts to take advantage.
You should also not use features such as "reload all tabs" if your browser have them.
Miky, you can open several tabs at once (for example, your quest thread in one of them, your hangout thread in another one, etc.) but it's not recommended because you might miss a fairy!
Not prohibited, just not recommended either. I'd suggest you to keep the number of tabs open to a minimum so you can handle them.
Btw, is it my site linked in the main post of an announcement?
*dies of an overdose of pride*