I have been fighting my own battle with the new Yahoo! Mail beta ads for some time now. Thanks to their partnership with my DSL provider AT&T, I now have the new “ads” feature and for some darn reason I just can not warm up to it. Well thanks to a reader submission I now have a way to ditch them and go back to the clean Yahoo! Mail beta interface.
All you need to do is to pick up this user script for the Greasemonkey extension. The Yahoo Mail Cleaner is a great fix for this really annoying issue.

Hey I see you, walking down the street – keeping your eye on me. Don’t think that I am not on to your little tricks, because I know exactly what you are doing. You are tracking me aren’t you?
Then once it is bookmarked…
Unlike most parental software you can put on your PC, I think 
Trying to browse through your old saved browser history can be a pain in Firefox in comparison with Internet Explorer.
Feeling a little paranoid these days?