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vertical tabs: It seems you are taking of an extension? (I got excited for a second but I couldn't find the option under settings). If you are talking about an extension then Firefox also has a similar extension that works very well.

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I think it means this [1], which is a screenshot from Opera 12 in 2011, but looks pretty much the same as I remember the tab sidebar working in 2004-ish.

I haven't used Opera for a decade, so I don't know if the feature still exists.

[1] http://forums.opera.com/discussion/1866076/tab-stacks-in-sid...

Opera 12 (pre-Chromium) used to have the features I mentioned built-in, which meant they were faster, fit in with the browser seamlessly and you didn't have to worry about security. Best of all, you didn't need to use them if you didn't have to. Unfortunately the new Opera is missing most of old Opera's features, but you can give Vivaldi a try.

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