I'm trying Vivaldi again since as an expat I depend on single-click in-browser translation.
For me, the killer feature is built-in no-nonsense vertical tabs, something I had in Galeon many years ago because it used the Gtk+ tab widget. I hate hate hate that Chromium cannot do this, because dogma.
Vertical tabs without the 'tree' aspect (at least when I last used Vivaldi). Firefox with Tree Style Tab extension is still the best option I've found so far.
I switched from Firefox + Tree Style Tabs to Vivaldi + Tab Stacks and I mostly prefer it. The ability to tile tabs within a group is the killer feature, as well as it being much better supported by being native. Stack by host is great too. The big tradeoff is that you only get one layer of nesting, but I find it's generally worth that tradeoff for me.
Neat! I'm not the grandparent poster, but I also can't stand horizontal tabs, probably because I'm a tab hoarder. But with screens wider than they are tall, vertical tabs make sense, and each new tab doesn't truncate all other tabs' titles.
I looked up MS Edge's implementation, it seems it only shows the tabs either on top or on the left of the window, with Vivaldi you can set it at any edge of the window, I have mine on the right side.
Indeed, for least distraction, content should start at the top left of the screen. For this, I already had my tabs on the right, but now I am trying bookmarks/address bar at the bottom.
Not sure I'll keep it this way ... but what I ♥ about Vivaldi is the choice. If I wanted training wheels, I would already be using macOS.
The last update was made in 2018. That's a long time. It would be nice to revisit this now that they've have added more services (Mail, translations, expanded Sync) and see their impact to the browser's privacy.
For me, the killer feature is built-in no-nonsense vertical tabs, something I had in Galeon many years ago because it used the Gtk+ tab widget. I hate hate hate that Chromium cannot do this, because dogma.