What is this addon?

UI and Macro
http://www.youtube.com/watch?v=bVtubNuKzGs&list=UU6idiEhlPEreqzCWfQ_GiLw&index=1&feature=plcp

2:37 in, there are two boxes on his cast bar- showing the debuffs on current target, I think. What is this?
DebuffFilter
Thanks!

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