Here is the browser market share for August 2013, based on traffic to my top site (number in parentheses shows change from July 2013):
Google Chrome: 41.58% (+0.74%)
IE: 28.72% (-0.49%)
Firefox: 23.17% (-0.60%)
Safari: 3.28% (+0.07%)
Opera: 1.06% (+0.17%)
Google Chrome came back to its winning ways in August, gaining 0.74% to 41.58%, and in the process showing that the dip in July was temporary. Both IE and Firefox showed pretty significant drops, while Safari and Opera both improved.
There were no major releases during the month of August. Sauce Labs did release a report on August 20th saying that IE had the highest error rate (crashes) among browsers, while Firefox had the fewest, followed by Chrome. The report also noted that all browsers are improving. By looking at the most recent browsers, Firefox 22 had virtually no errors, Google Chrome 27 came in second, while IE 10 was third on the list. While error rates isn’t likely the determining factor when consumers decide whether to switch to a different browser (my opinion is speed is the most important factor), it is possible that the high error rate is one of the reason for IE’s fall in recent years.