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Testing the Firefox alternatives
(tommorris.org)
A place to discuss the news and latest developments on the open-source browser Firefox
Zen is very good
I just wish it had normal top bar tabs (or maybe it does and I haven't found the option), because I love the overall style, but vertical tabs take up too much space after widening the side bar enough to see the tab names easily.
Then try Foorp, it's something like Zen but with tabs on top. I've used it before, but it's not very smooth for me.
P.S.
Maybe something has changed in 2 years.