Opera and FF are both good in terms of usability, but still have compatibility issues, which forces me to use IE ocassionally. Though I disagree above observations, Opera barely takes any more memory than IE or FF does on my PC. In fact, right now I have all 3 browsers running the same website and FF 2 is using the most amount of memory (25,656k) followed by Opera 9 (19,888 k) and IE 6 (19,568 k)... IE 7 sucks anyway so I uninstalled it.
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