Yahoo hass started a thing of blocking access to your e-mail for 15 seconds if you are running an ad blocker. TO stop this you have to either allow ads or pay for a premium service. I can live with that HOWEVER if you are running an ad blocker you also can not clear your spam folder OR block e-mails!
I remember when yahoo was a great service but not any more. Even though it is a lot of work instead of doing what they want I will I will set up email with a different provider and just let this one eat up space on their server collecting spam and junl mail