Lunascape
"The freeware Lunascape combines the three most important browser engines"
The browser engines are integrated
Trident (Internet Explorer)
web kit (OpenSource e.g. Safari and Chrome)
Gecko (Firefox)
With the overlapping view (cascade view) tabs can be displayed side by side. Many Lunascape functions, including the handling of tabs, mouse settings, keyboard shortcuts, toolbars, the search function, start page, favorites and the RSS reader, can be customized.
According to the manufacturer, Lunascape is one of the fastest browsers and in the new Lunascape version 6 it offers support for Firefox add-ons including simple transfer of the add-ons used in Firefox.
More information in the download area