I am just a regular user that was looking for a Firefox alternative for a long time. I do not know why Helium does not get more attention. It's so fast all the time even with several hundred tabs, it never crashed, it is strongly privacy and safety protecting, I do not have one complaint about it.

Here are some ways the others fall short:

- Firefox and all its derivatives are frequently incredibly sluggish, even on the same machine at the same time other browsers based on Chromium and Webkit are fast. I really wanted to like them, but I just gave up finally. I can't even use Mullvad browser now.

- Safari's interface and UX seems somewhat clunky to me. I tried Orion; it shows a lot of promise as my secondary browser, but, even after updating it today, it has significant UI regressions. And this is for software that's past version 1.0.0

- Brave browser was pretty good, but I was disillusioned by their not taking user protection as seriously, and some of their "scandals"

- Of course, the least said about IE, Edge, Chrome, etc, the better

And I've tried a large number of browsers over the years: IE, Edge, Firefox, Opera, Safari, Konqueror, Chrome, Chromium, Firefox, Orion, Zen, Brave, Mullvad, DuckDuckGo, Vivaldi etc, etc.