I've been something of a fanboy of Opera for a long while now. It's quick-loading, has strong caching and doesn't hog memory like Firefox used to. However, with FF cleaning up house for its 3.x family, by fixing all those memory leaks, improving performance by leaps and bounds and introducing those little features (page zooming for e.g.) that make things ever so friendlier, I'm of a mind to switch back to it.
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