Google has been supporting Firefox well all along. Little did we all know that Google itself has an open-source browser in the works called Google Chrome.
Recently Google published a comic at Google Books highlighting some features of this new browser. For all we know so far is that Google Chrome will be based on WebKit engine and will feature special tabs (not like the ones you see in Firefox).
According to Googe, the browser will feature tabs which run as separate processes to ensure security and stability. This way if one of the tab crashes accidently, it won't influence your work in other tabs.

Apart from featuring a new tabs concept, it will boast some of the following features:
- An address bar with auto-completion features called omnibox.
- An InPrivate privacy mode like IE8, called Incognito.
- Google Gears Integration.
- Stand-alone support for Web Apps.
- Default homepage with Opera SpeedDial-like feature.
Google Chrome will be released in some hours in its early BETA for Windows users. As it evolves, Mac and Linux versions will be available too.
Keep checking out for the following link, it will be updated as soon as the browser is made public.
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