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I was expecting tab folders to match with the new vertical sidebar, but count me unimpressed.

Bookmarking feature to bookmark multiple tabs, among other things. That actually sounds useful and innovative. If you can pick a folder for those bookmarks and search them, that would be a killer feature.

They added a new context menu option to close duplicate tabs

Duplicating tabs, pinning tabs, stuff like that seems new to me as a Firefox user.

edit: Yeah, you're right, old features, I just didn't use them. :-D

They’ve been there for a long while, I don’t think they’re new.

Pinning tabs has been in Firefox for about a decade, I think!

The context menu item for duplicating tabs might be new, but you've been able to middle-click the refresh button to duplicate the current tab for quite some time now.