I deal with an issue with Firefox where it causes my Home Assistant dashboard become non responsive if the tab is not the primary one always on screen. I think it's something with the forced snoozing of tabs. I've tried other Firefox based browsers and face the same problem. So this leaves me with.... Chromium based browsers. As a Linux user, it's either Firefox or Chromium based. With that said, I have not had the issue with the Chromium base, but because it's mostly consumed by Google, I reject it mostly.
I did find that Zen was very nice to look at, and they do have an opinionated way of setting up the tabs (I don't care about the vertical tabs). They also seem to be wanting to roll out their own extension store? In the form of "Zen Mods" but are also cross compatible with Firefox Extensions so that's good I guess. I use a rolling release (Arch) OS, so I do see a lot of updates to Zen, the devs seem to be really working on it. For now - I'm on Firefox dealing with the unusual Home Assistant thing. I've used Firefox since it was before version 1 so I'm a bit stuck in my ways. :)
I really wish that there was another browser engine there which I could use which supports the Adblocking and Bitwarden (My most important extensions). It's a bit disappointing to see that Edge, and all other browsers have adopted the Chromium base. I am hoping that with the latest judgement and order against Google to sell off the Chrome browser, sticks and if so, that the new owner(s) will strip it of some of the garbage which has been forced on the code base. (Manifest v3 comes to mind). The only Chromium based one I tolerate on my system right now is Ungoogled Chrome and Vivaldi, who has said that they are resisting the Manifest V3 as much as they can and have a somewhat decent adblocking built in using their end. Even though I have DNS level adblocking, Ublock Origin fills the gap with some of the ads which gets past my end.