Firefox still hasn't suffered from its flaws actually being exploited like IE has. In fact, usually Mozilla patches its flaws before they're discovered by anyone, so keeping an eye on the update icon is a very good idea.

I'm running the 1.5 beta, and it's great. Seems much faster. I waver back and forth between it and Safari (yeah, a Mac guy).

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Opera is now free, has all the functionality of Firefox without needing plugins, and is almost twice as fast.

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Can you confirm that it's a feature-for-feature match with Firefox, including all available Firefox plug-ins? That's a pretty big feature set, considering there's a large community that has created hundreds of Firefox extensions.

Or do you mean that it has all the functionality of FF, not counting plug-ins?