I think we can (almost) remove Opera from the blacklist now, see blocking bug 36000. Opera < 12 should still probably be blacklisted, though, and < 10 should be blacklisted for sure (there's a bunch of people who insist that 9.64 was the ultimate version ever and stick to it).
It'd be cool if it could be added to the whitelist as well, but I guess that would be a promise to support it and you guys probably don't want to promise that ;)
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