Firefox 3 is based on the new Gecko 1.9 Web rendering platform, which has been under development for the past 30 months and includes nearly 2 million lines of code changes, fixing more than 12,000 issues. Gecko 1.9 includes some major re-architecting for performance, stability, correctness, and code simplification and sustainability. Firefox 3 has been built on top of this new platform resulting in a more secure, easier to use, more personal product with a lot under the hood to offer website and Firefox add-on developers.

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