Toolbar/sidebar browser extension

Methods and other embodiments associated with a web browser extension are described. One example browser extension includes a toolbar logic to provide a toolbar. The toolbar may include, for example, a set of graphical user interface elements displayed in connection with a browser window. The browser extension may also include a sidebar logic to provide a sidebar. The browser extension may also include a coordination logic to coordinate the presentation and functionality of a combination of the toolbar and the sidebar to be provided to a browser. The presentation and functionality may be based, at least in part, on a selectable presentation mode and a selectable attachment mode.