mmm.. that study looks too old to be relevant, two things on that:
1) Numbers from 2010 do not include mobile browsers with widespread use nowadays.
For example: "Opera Mini". We have >1% of requests only from this browser (and I bet than in 2015 Yahoo is seeing quite a few of those). Note that this 1% is a more precise one, derived directly from hadoop logs, requires no guesswork.
2) Our data differs from global stats in significant ways.
For example, our IE6 and IE7 traffic is way higher than global stats reported by http://gs.statcounter.com/ on the month of January. And note these browser percentages are more precise estimates on our end (unlike the javascript estimate that requires some cross checking and guesswork). Also, note the total percentage we report over pageviews includes bots so excluding those our IE6 and IE7 traffic is even higher than the one I am noting below.
Browser, Percentage of total pageviews by our account, global percentage by statscounter
IE6: 1.01%, 0.09%
IE7: 0.7% , 0.14%
I do not expect that our numbers are going to match 100% to statscounter but I think is an OK guide to cross-check oneself, especially cause they deploy their beacons worldwide:
http://gs.statcounter.com/faq#methodology
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Finally, is there a way to gauge the difference in JS support between anonymous & authenticated users from this data?No, I do not think we can do that with this dataset.