Tabs are hard to close now.
The new "tabs" are ****. You have to hover in just the right spot to get the X to close it, and then it sometimes disappears before you can click it and you have to try the hover move again.

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Tom Frye commented
In Yahoo mail, those little bubbles you call "tabs" are annoying. If the title of the email is longer than the length of the bubble (which is almost always), the little X needed to close that tab slips behind the title, making it impossible to close that "tab". The work around (until you fix this) is to click on Compose, and then you have the option of closing all tabs. And furthermore, paying users shouldn't have to tell you these things. Force your developers to use Yahoo mail and then they will realize the errors of their ways. IMO the only thing that makes the new Yahoo mail better than the old Yahoo mail is that it no longer wastes one entire line on email dates, which was completely unnecessary since there is a field for the date and time on the far right of the listing for each email. I've been using Yahoo mail since 1996. I wish I could tell you that I'm a very satisfied customer. Maybe I will be someday. Thanks.
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Thanks Matt for letting us know. We could replicate the issue and we noticed other users having this issue. We are looking into making it better. Thanks again! We will update here once it's been fixed.