Literally recently, Firefox Nightly 22.0a1 has the opportunity to surf sites without launching a full-fledged browser.

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At the moment, the browser doesn’t have very many functions, there are not enough add-ons (it was especially unexpected to go to sites without Ad Block), but you can use the browser almost fully. Plugin support was not noticed either.
Of the nice things - smooth and beautiful scrolling, although quite slow. But oddly enough, immediately found about: config which helped in resolving this issue. In addition to the article, there are several screenshots at once, so that you can imagine how everything looks.
The number of available settings is simply amazing.

Search and address bar are combined into one, the result of other search engines can be selected below.

And this is the open page with the included tabs (if you turn them off, the screen is 100% busy with content and no controls are displayed at all).

From the planned, you can note full-featured download managers, history and bookmarks, yet add support for add-ons (unfortunately they, oddly enough, will not be compatible with add-ons of the big brother), synchronization between the desktop and mobile phone on Windows Phone using Microsoft services and many other buns.