Today there was a release of another version of Firefox after a release of 4.0 on 22nd March 2011. Firefox is also available for Android hand-held’s and iPhones, check out http://www.mozilla.com/en-US/mobile/. Take for instance Chrome 11 was released on 27th April 2011 and Chrome 12 was released back on 7th June 2011.
Concentration seems to be mostly on secure browsing, improved performance and CSS animation and 3D.