Firefox 7 : Faster, Less Memory, No HTML5 Improvements

Just installed Firefox 7 and it runs faster than Firefox 6 with less memory usage . Windows Task manager is reporting on the same sequence of browsing steps ending up at Google.com that Firefox 7 is using 32% less memory than Firefox 6 required for the same operations. But the HTML5test.com results were identically the same for Firefox 6 and 7; 313 with 9 bonus points.