More importantly, the new beta allows users to quickly switch between Aurora, Beta and Stable channels from the About menu of Firefox to “test features at various levels of development, quality and polish.” No visible interface changes made their way into the 5.0 beta, though from a first series of tests the speed and memory optimizations when dealing with dozens of open tabs seem remarkable.
Improved canvas, JavaScript, memory, and networking performance.The Do-Not-Track header preference has been moved to increase discoverability.Added support for switching Firefox development channels.A detailed list of changes is provided in the Beta channel release notes: Available for Mac, Windows and Linux PCs, the new Firefox comes with performance and stability enhancements, as well as support for new CSS animation standards.
A few days later than originally expected, Mozilla updated the beta channel earlier today to include the first public beta of the next major version of Firefox, dubbed Firefox 5.0.
