Remove the giant "Unsubscribe" button when hovering over message in Inbox
In the new Mail interface, simply hovering over a line in the Inbox shows a bunch of icons (folder, star, trash) as well as a giant "Unsubscribe" button. That "Unsubscribe" button is much larger than any of the other icons, and is much too easy to click on accidentally when I simply want to open the email message to view it. Personally, I don't need any "Unsubscribe" button at that level at all, but if you have to have one there, just make it MUCH smaller icon.
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