7 points
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Aside from the completely customizable UI, I’d say tab stacking and tab tiling. Web panels are cool as well, you can have translators, calculators and whatnot in your sidebar for quick access that way. It also has a built-in RSS feed reader which is neat.
1 point
Yes, tab stacking and tiling keep me using Vivaldi at work. They’re great, and I remain super sad that there’s no real equivalent in Firefox.
I still use Firefox on my personal computers, but I silently weep a little bit whenever it would be super useful to stack or tile tabs.
