All browsers are broadly similar, with the exception of Google Chrome, which is very different in design. Of Firefox and Opera, Firefox is probably closer to IE in design.
And about add-ons: they don't require much effort to find. You can use the vanilla browser if you don't want to add anything. Then if you want additional functionality, find an appropriate add-on. Once it's installed, you don't need to do anything else, unless you want to further customise it. What marks out Firefox is its potential. You can use as much or as little of it as you want.
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