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* music playing
* social networking
* office productivity
* file sharing
* real-time chat
* etc. etc. etc.
Yes, I understand that the modern web browser is a really nifty multitool that can do all these things.
But it shouldn't be seen as the way to do these things. At best, it's a tentative workable means to tide one over until a more permanent means is found. Such as:
* downloading music and playing it with a dedicated player
* utilities that interact with social network sites (e.g. third-party Twitter clients) <-- this is something that is actively being hindered by social network sites, partly for ad revenue reasons
* office productivity suites, unless you're using Google Docs for quick sharing
* Dropbox, Filezilla, etc.
* IRC clients, Teamspeak/Ventrilo, etc.
* games being locally stored and run on one's machine
* other things, like a PDF snipping tool that could actually be downloaded (PDFScissors, while convenient, can't...and it bugs me)
If you're going to do all these things in the browser anyway, you might as well make the browser the OS itself.