According to StatCounter, March was a tough month for Firefox. It dropped 1.73% in Europe (down to 36.81%). On the other hand, IE gained 1.01% (up to 50.15%), and Opera gained 0,55% (up to 7.9%). It looks like Firefox users may actually be switching to IE and perhaps also to Opera, which must be worrying for Mozilla. Is Firefox is more vulnerable to changes in the market than other browsers? As we recall, Chrome actually caused an increase in the number of Opera downloads, and accelerated Opera's desktop user growth. …
Safari and Chrome are also battling it out between them, and Chrome seems to be winning. Safari dropped 0,12% in March while Chrome gained 0,16%. Safari 4 did borrow liberally from Chrome (which borrowed liberally from Opera), but it didn't seem to help. Still, if we consider the vast amount of resources at Google's disposal, and the amount of money they have spent on Chrome advertisements all over the Web, the money does not seem to have been well spent. On the other hand, with a mere 1.88% of the European market, Chrome is still hailed as a success by just about everyone.
It should be noted that with 3.69% in July 2008 and 7.9% in March 2009, Opera has nearly doubled its market share in Europe in less than a year. This is also reflected in the number of monthly users, as reported in our quarterly results. Note that Opera is actually growing in all markets we are keeping track of, including European countries.
See the graphs from StatCounter here:
Update: It looks like the StatCounter stats have been updated since I posted this about 3 hours ago. Now IE has 52.9% (even more growth), Firefox 35.06% (and an even steeper dive), Opera 7.01%, Safari 2.35%, and Chrome 1.88%. Screenshot:
(So are these stats actually 100% correct? Probably not, since "global" browser statistics are very unreliable. But it's fun to "spin" the numbers a bit, especially after the media has been taking stats from certain unreliable stats companies as gospel for years.)