Firefox is much more secure than IE! There is a toolbar/add-on that most webmasters use called Wb Developer! It means you can edit pages, take css codes, templates and all that jazz! I would strongly recommend you give it a go! You'll love it!
Firefox is definately the way to go, all the add ons and slowly but surely it is becoming more and more popular - developers and designers use it for all the plug ins and add ons.
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