MultiZilla is a multi-tabbed Mozilla based browser extension, but it uses less memory, if you open more then one browser window. It opens tabs faster then any Mozilla browser window. It allows you to open more tabbed windows if you like. It also allows you to open one or more non-tabbed windows or a combination of them. You can easily switch between tabs instead of going from one window to the other.
Note: You must have a recent Mozilla build installed.
Download: MultiZilla for Windows 1.1.32 Beta 2
News source: BN