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Mozilla Will Launch A New Browser For Developers Next Week
The First Browser Dedicated to Developers is Coming
We’ve redesigned the browser by looking at it through a completely new filter to put developers’ interests first. It’s built by developers for developers so you can debug the whole Web, allowing you to more easily build awesome Web experiences. It also integrates some powerful new tools like WebIDE and the Firefox Tools Adapter.
allowing you to more easily build awesome Web experiences
but too many sites won't work with Safari any more (YouTube and some link analysis programs)
I think Youtube is no longer checking user agents - probably testing functionality instead.