1. A non-transitory computer-readable storage medium storing computer-readable code which, when executed, implements a browser application comprising: a content display portion including: a content portion for displaying page content information; and a content control portion that is separate from a browser control portion and is for displaying content control information, wherein the content control portion is adjacent and above the content portion and provides the content control information as a user customizable user interface for controlling the page content information, such that a user of the browser application specifies a portion of the content control information provided as the user customizable user interface, the specified portion of the content control information being associated with a profile of the user, wherein the user customizable user interface comprises controls including a subset of selected contents, which are selected controls distributed in a single line near a top of the content display portion, wherein the user specifies the portion of the content control information provided as the user customizable user interface using dueling listboxes, wherein a first listbox of the dueling listboxes includes a set of all contents that are available to be specified as the portion of the content control information provided as the user customizable user interface, the set of all contents not including the subset of selected contents, wherein a second listbox of the dueling listboxes includes the subset of selected contents, which are the controls selected, by the user, from the set of all contents included in the first listbox to specify the portion of the content control information provided as the user customizable user interface, and wherein the dueling listboxes are displayed in the content portion that is for displaying page content information.