Made my Basic Yahoo Mail for Firefox free of Ads.
If you switched to the New Beta Yahoo Mail, then you have to suffer all the ads, so downgrade until the developer has made it work for the New Beta Yahoo Mail. I donated to show the love because with this add-on solves a problem when it is working.
I sometimes use the new Yahoo in Chrome and then use Webmail Ad Blocker, but that does not reclaim all the space from the ads. At least I am not drained by the ads while working.
I am desperate for Yahoo Mail Hide Ad Panel to work on the New Yahoo Mail!