1. One or more computer-readable storage media embodying computer-readable instructions which, when executed, implement a web browser comprising: a web browser user interface; a content rendering area within the web browser user interface; and a control layout area adjacent the content rendering area, wherein the control layout area includes a user-selectable icon that is always available to the user in the control layout area, said user-selectable icon having a single function that is user-configurable, wherein the single function selected by the user is assigned to the user-selectable icon and is selectable from among two available functions including a tab function and a favorites function.