No longer a fledgling upstart, Firefox is the gold standard of alternatives to the still-dominant Internet Explorer. This browser is full-featured, secure, and lightning fast--although competition is strong and it can no longer be said that Firefox is the fastest browser available. Its killer selection of add-ons remains strong, however, with built-in support for the next generation of themes, called Personas.
The latest update to Firefox 3.6.6 fixes security holes and solves some problems with plug-ins crashing (for example, most notably, a Flash or Silverlight crash now won't take Firefox down with it). Upgrading is highly recommended.
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Mozilla Firefox is a fast, full-featured Web browser. Firefox includes pop-up blocking, tab-browsing, integrated Google search, simplified privacy controls, a streamlined browser window that shows you more of the page than any other browser and a number of additional features that work with you to help you get the most out of your time online.
By far the most compatible and most supported browser available on the Mac, have never had page rendering problems in 3 years of use, actual speed (as opposed to speed tests) is pretty quick, good customisation and add ons if you need them.
Slightly slower on initial page rendering than Chrome or Safari, but at least as quick in practice, as caching seems to make pages load quicker than in Safari when you go back to them. Still looks a bit ugly and inconsistent with other Mac programs.
Other browsers sometimes feel a little quicker, but this one overall is as quick in practice for me. The only feature I miss from Safari is dragging to the dock icon for a search - otherwise it now does everything just as well, and is simply much more reliable with rendering and more widely supported. If you just want webpages to just work, this really is the most reliable option for the Mac in my experience. I have never had problems with Firefox on Snow Leopard (unlike some of the other reviewers), whereas Safari crashes occasionally, especially with Flash video websites. Adblock extension (also available for Chrome and basically doable for most other browsers now) works well. Firefox also has the best support for other languages and encoding in my experience.