The Performance by Browser Report allows you to see the top browser/browser version/OS combinations hitting your site and how they are performing.
Analyzing the Performance by Browser Report
The report consists of a bar graph and table. The data is laid out such that each browser/OS combination has an average performance number (over the given time period) listed for each of the available metrics.
To toggle on/off the different metrics, scroll to the bottom and right underneath the graph you'll see the legend. Click the legend items to turn on and off the metrics in the graph. They will appear as additional bars in the graph. Note the more metrics you turn on it becomes a little more difficult to read the report as the space quickly becomes filled with new bars and text becomes smaller.
Also, in the graph under the browser name there is the total number of hits listed by that particular browser. This gives you context into the prevalence of each browser/browser version/OS combination hitting your site.