From December 21st, 2014 to December 21st, 2014, 100% user give 1-star rating. for D3.js Sidekick chrome extension.
Searched for rollup, got a short one-line explanation above a gray box of unknown purpose. Thought it might be a sort of console but doesn't allow typing. Every search is the same, you get a couple of words above a pointless gray box. Doesn't even let you click out to the real help pages. Glad it's free.