Should you wish to see what your web documents look like in specific browsers Screem has support for 4 different ones. The first is the default GNOME viewer for HTML documents which can be set from gnomecc. The other three are user definable. If one is not set then left clicking on the toolbar button will display a dialog where you can set the icon to display, and the application to use. If already set the left clicking will display the page, whereas right clicking will display the configuration dialog allowing you to change the application and/or the icon.