Opera 21 was released a few days ago. It boasts a whole bunch of things I couldn't care less about. What caught my attention was the user agent string. It now looks something like this, depending on which setup file you're served:
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Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.132 Safari/537.36 OPR/21.0.1432.57 (Edition Campaign 48)There's lots of variation in the campaign number, making users stand out a lot more. That's on top of the fact they're using Opera. And that the user agent string exposes the minor version.
Firefox on the other hand has a user agent string that's as cleaned up as possible.
The regular installer is available at http://get.geo.opera.com/pub/opera/desktop/ because hunting for hidden links is so much fun.
Another privacy-related issue I could never stomach is the fact that its anti-malware feature sends the URL of every page you visit to Opera.
Firefox on the other hand only downloads a list of malicious sites from Google and performs the check locally.
