As another Opera 12 + Win7 user, there are 2 errors. A ReferenceError (undefined variable pluginlist when trying to add "Java") and a TypeError (CourseApp.Views.ChallengeMenu is not a constructor).
BTW, people aren't downvoting you because of your convictions as you seem to think according to your profile. They're downvoting you for a complete lack of contribution to the comment thread. That's why people downvote on Hacker News.
While it certainly isn't as bad as some other sites, I think it is naive to suggest that nobody has ever been downvoted on HN for having an unpopular opinion.