I'm fairly certain that something like that goes against the Adsense ToS... I know there is an Adsense-preview plugin for IE from Google, which I assume was used to make the tool. There is also something similar for Firefox, which seems to be tolerated...

so far.

im sure its a great tool tho well done with the sand box

[signature removed. -Philipp]

Wow... great! I really need this tool... thanks!