Mozilla has released Firefox 3.1 Alpha 1 - code named Shiretoko Alpha 1 and is now available for download.
=> Web standards improvements in the Gecko layout engine
=> Text API for the <canvas> element
=> Support for using border images
=> Several improvements to the Smart Location Bar
=> A new tab switching behavior
=> Download Linux version here.
You may also find my step by step easy instructions on how to install the Firefox browser under Linux useful.