Tab Splitter splits your browsing area into two panels which are resizable and can be positioned either horizontally or vertically. You are allowed to drag and drop tabs between the two browsers or you may right click on links and open the link in either of the two browser. Tab Splitter also features its own tabs and url bar. Complete with a search bar and advance search features. If Split Panel 0.8.6 is installed, then Tab Splitter will not work properly.
This add-on is no longer being supported.