Firefox 3.5 (CodeName Shiretoko) Beta 5 is a public preview release intended for developer testing and community feedback. It includes many new features as well as improvements to performance, web compatibility, and speed. We recommend that you read the release notes and known issues before installing this beta.
Firefox 3.5 (formerly known as Firefox 3.1) Beta 5 is now available for download. This milestone is focused on testing the core functionality provided by many new features and changes to the platform scheduled for Firefox 3.5. Ongoing planning for Firefox 3.1 can be followed at the Firefox 3.5 Planning Center, as well as in mozilla.dev.planning and on irc.mozilla.org in #shiretoko.