Firefox is used by approximately 25% of web users but among those who are aware that they have a choice of browsers the figure is probably closer to 70%. On Tuesday Mozilla announced a major upgrade to Firefox 3.5 which will affect the way that millions of people experience the web. Ars tecnica provided a good review of the new features which focus on speed, flexibility with tabs and, as Mozilla's Alex Faaborg emphasized, privacy. The open source Firefox grew in popularity because of third party extensions and 3.5 should increase the ability of developers to offer customizations. The new version supports HTML 5 which allows video to run natively in the browser without Flash or Silverlight plug-ins. Fonts can be automatically downloaded which will grant significant flexibility to designers.

There was concern by some, including Stepforth, that existing plug-ins might not work with the new version and Mozilla has already scheduled the first patch to address 'topcrashes'. Still, there seemed a consensus that Firefox 3.5 was the most progressive browser available, leaving Firefox Director Mike Beltzner to speculate on next steps which might include a revamped interface with disappearing location bars and semantic logic that anticipates the user's next request.

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