Androidmeda
It's been a year since the video that triggered the lawsuit was published. I doubt that someone at Opera has been pissed off for a year and done this without thinking through it at all.
Probably because this isn't about features that already exist, but about features that Opera was working on and hadn't even made public yet. And this guy sold them to Mozilla or something.
Opera never had problems with other browsers copying them once the features were actually out, but in this case Opera's secret features were sold to Mozilla before Opera even had a version of their own.
http://www.newsweb.no/newsweb/search.do?messageId=326699
At the same time, they published a report on usage of their mobile browsers:
http://business.opera.com/smw/2013/03/
Record profits and revenues, and 20 million new users from February to March. Doesn't exactly look like a company in trouble to me.
But maybe you know something I don't.
All you need to do to avoid being sued is to not sell trade secrets to competitors.
This doesn't sound like a very clever thing to do. It sounds very illegal indeed.