I feel compelled to jump in and give a warning about Opera. I also know that the herd mind will probably pound my comment into oblivion, which is why I made a new account.

Opera is scammy, unreliable software. DO NOT DO MISSION CRITICAL WORK WITH THIS BROWSER. It will flake out on you in so many uncanny ways its not funny.

Also, Opera had the weird habit of becoming my default browser on my Win 7 machine repeatedly, despite me never doing so and only referencing it for testing purposes.

That, along with Opera having the top 3 spots on HN's front page further indicates to me that Opera is not for real. Like I mean, come on. How many of these submissions and upvotes are fake.

Opera, you're not on the up and up and you know it.

TL;DR: Don't trust Opera.