Tabs on the side is the real reason I am using Vivaldi as my primary browser. Tab stacks are useful, too, although I typically only use them when doing researc

Tabs on the side is the real reason I am using Vivaldi as my primary browser. Tab stacks are useful, too, although I typically only use them when doing research of some kind. Just installed the new version with two-level tab stacks, seems pretty cool so far, but not yet sure how useful they will be in day-to-day browsing.