Finally, Firefox 3 RC is now available for download, but to remind everybody this is still not release-level code! most Firefox 2 users should continue to wait what will probably be just a few weeks until the release-level Firefox 3 comes out. The release notes make clear that there are still lots of bugs in the program which may or may not be fixed before the program is finalized.

But with version 3 has a number of enhancements and there are also some performance improvements which are obvious after you work with it for a while, especially in terms of memory consumption. My experience with Firefox 2.x often finds it consuming hundreds of megabytes of memory, so I’m hoping on this new one will not consume most of my PC memory
Take note  also with your existing add-ins it may also be disappointing. All of the big ones do seem to work, but every new important version of Firefox has broken at least some add-ins. So don’t install it unless you have time to be Mozilla’s guinea pig.

New features and changes in this milestone:

• Improvements to the user interface based on user feedback, including changes to the look and feel on Windows Vista, Windows XP, Mac OS X and Linux.
  
• Changes and fixes for new features such as the location bar autocomplete, bookmark backup and restore, full page zoom, and others, based on feedback from our community.
  
• Fixes and improvements to platform features to improve security, web compatibility and stability.
  
• Continued performance improvements: changes to our JavaScript engine as well as profile guided optimization continues to improve performance over previous releases as measured by the popular SunSpider test from Apple, and in the speed of web applications like Google Mail and Zoho Office.

Testers can download the Firefox 3 Release Candidate builds here