Techniques to facilitate finding a tab or tabs in a user interface window are described. Various embodiments present tabs, individual tabs being associated with an opened document such as a web page or an activity, in a user interface window and automatically group at least some of the tabs together in a visually distinctive way. In at least some embodiments, this grouping is performed in response to a user interacting with the tabs in a particular way. For instance, a user may cause a tab to be created or moved within the user interface window such that the tab is grouped with a tab group or ungrouped from a tab group. Furthermore, one or more embodiments provide for certain tab-related actions, such as selecting an active tab and changing a display of a title of a tab, which can be performed in a manner based at least in part on this grouping.