Every Tabber has an anonymous identifier that allows us to keep track of how many active Tabbers we have, how many tabs we all open, and other basic usage stats. We’ll often use this anonymized info for aggregate statistics, such as “People from Chicago open lots of tabs on Tuesdays”. We also use this info to figure out how to make Tabbing better, and sometimes to make awesome infographics.
You also have the option to create an account by providing a username and your email address. If you do this, we’ll link your data to this account, which lets you personalize your new tab page.