The freeware browser Lunascape combines Internet Explorer, Firefox and Google Chrome under one roof.

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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)

You can switch between the engines on all tabs at any time.
Tabs can be locked or moved using drag'n drop. 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.

It is useful if three engines are already combined in one browser, the triple display which shows a website side by side in the three different browsers.
Useful to check your own website for display errors in the various browsers.

The new “Orion” interface offers intuitive use of the browser and can be adapted to personal preferences.

The browser is definitely worth a test with its approach.