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I work in technical support for an eCommerce company. I have two FF browser windows open with 5-8 tabs in each one (minimum). I manage whatever issues I'm working on plus look up other sites to assist the lower level techs with their questions, too. Sometimes I'll need to test email functionality, so I'd open GMail, Yahoo Mail and Hotmail all at once. So, yes, there are real reasons to open multiple tabs (I also have Opera and Safari installed, too, for those rare instances where I need to test those browsers, too).
I use whatever fingers feel comfortable at the time. It depends on the words being typed whether it's the left or right hand. The majority of the typing is done with my index fingers, but ring fingers on each hand get their fair share, as well as the occasional thumb for the spacebar, depending on what the index fingers are doing at the time.
Yeah, I backspace a lot, but still type faster than almost anyone I work with.
I could probably do the same thing with a Dvorak keyboard after a few weeks or practice, but why would I bother? What would be the benefit to learning a new keyboard that would only be at home? Work likely wouldn't provide me with a new keyboard without a valid reason. I have no family nor friends who use Dvorak keyboards. While it would annoy my wife on those rare occasions when she needed to use my computer, that's not enough of a reason to move over.