The long wait is over.Firefox Fans its time to rejoice as the beast is out,Firefox 4 stable version is now released.The Release Candidate version 1was released on March 9th, 2011.I hope all known issues are fixed and the latest version is ready to rock.

Firefox 4.0
  1. Firefox For Windows ( link for Firefox 4 removed)  
  2. Firefox For Linux 

You can also download it from their official website If your favorite extensions are not compatible with the latest version,Learn how to make them work and if you like to see the results of the detailed tests conducted on Firefox ,Check this