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It was NCSA Mosaic that introduced the world to the Web. Since that time, the browser has become the principal software-based element in all the world's digital communications and transactions. It is the harbinger of a very powerful new class of dynamic language interpreters, making JavaScript the unlikely, though undisputed, vehicle for conveying interactive functionality. And for some manufacturers, it is the center of an apps ecosystem unto itself.

So the browser is in no danger of disappearing. But as the Web expands into a delivery mechanism for all forms of applications and services, is a stand-alone, exclusive window into the Web, complete with bookmarks and toolbars and add-ons, truly the most sensible usage model for a system that may yet embrace all of computing? This is a question Mozilla began asking last summer, and whose answer remains inconclusive.