I just added 1 month Kaspersky to the cart, then figured I'd change to a year. Couldn't adjust quantity to zero and update (wouldn't allow change of quantity field), and couldn't see any other way to remove item. Tried to add the year subscription to the cart but it said I had to remove the other item first.
No big deal, could really use another month of performance testing to determine if I want to keep it. I just figured I'd let you know about the problem. Using the latest Firefox.