Multiple Sites, One Browser SimulBrowse lets you browser multiple web sites at one time. Unlike other browsers which only view one site at a time or crowd multiple windows together, SimulBrowse opens sites on separate browser tabs. See a screenshot. SimulBrowse Requires Internet Explorer 4.0. SimulBrowse allows you to browse multiple Web sites at the same time when using Microsoft Internet Explorer 4.x. Each site is opened on a separate tab, allowing users to switch between them easily. The number of sites that can be opened is only limited by system memory. This version allows you customize and create toolbars, open groups of sites with a single click, drag and drop URL's on other browser tabs, and more. You can turn loading images, sounds, videos, animations on and off; to limit the displayed title length; a drop-down Favorites menu, open new tabs in the background, to organize the favorites dialog; and more.