Read the Privacy section: > Your tab URLs are never transmitted or disclosed to either the OneTab developers or any other party, and icons for tab URL domains

Read the Privacy section: > Your tab URLs are never transmitted or disclosed to either the OneTab developers or any other party, and icons for tab URL domains are generated by Google. The only exception to this is if you intentionally click on our 'share as a web page' feature that allows you to upload your list of tabs into a web page in order to share them with others. Tabs are never shared unless you specifically use the 'share as a web page' button.