I've been using Firefox since 2014. Every browser I've tried since (Chrome, Edge, Brave, Vivaldi, Arc) got installed, used for a week, then quietly removed because nothing felt like home. So when I kept seeing posts about Zen Browser, a "calmer" Firefox-based browser focused on workspaces and minimalism, I figured it would be the same story. A weekend of distraction, then back to my muscle memory. Three weeks in, I'm actually thinking about staying.
Yes, it's actually Firefox underneath
Zen is a fork of Firefox, the same way Mullvad Browser is a fork of Tor Browser is a fork of Firefox. That matters because it means every uBlock filter, every container extension, every privacy add-on you've spent years tuning works on Day 1. I imported my Firefox profile in about ten seconds and everything came across. Bookmarks, saved passwords, extensions, container assignments, all of it.
What's different is the chrome around the page. Zen redesigns Firefox's interface from the ground up to feel less like a browser and more like a focused workspace. Tabs go vertical by default, the URL bar can hide entirely until you summon it, and the whole thing has the kind of restrained typography you usually only get in native Mac apps. Calling it "calmer" is marketing-speak, but it's not wrong.
Workspaces are the killer feature
Zen's workspaces aren't tab groups. They're separate, full-screen contexts you switch between with a keyboard shortcut. I have one for work email and Slack, one for my homelab project, one for personal email and reading, and a "scratch" one I use for whatever I'm researching. Switch workspaces, the entire tab strip changes.
Containers (Firefox's profile-isolation feature) bind to workspaces too, so my work workspace is a separate cookie jar from my personal one without any extra setup. The result is genuinely the most organized my browsing has felt in years. I used to keep 60 tabs open across two windows. Now I keep ten per workspace and find what I need instantly.
Mods, the low-key feature
Zen has a community mod store that's basically a curated list of CSS and small JS tweaks you can install with one click. As of this writing there are 77 of them. Most are visual (rounded corners, custom cursors, that kind of thing), but a few are actually useful, like a better find bar, a smarter mute button, and a scrollable sidebar.
This is the part Firefox always had as userChrome.css hacks that nobody could find. Zen turned it into an app-store experience. Whether that's a good thing or a slow slide into Chrome-Extension Mall is a fair debate, but right now the catalog is small enough to feel curated, not chaotic.
What's not great
It's still in beta and you can tell. I've had two crashes in three weeks (both during video calls in a tab, both not catastrophic). The settings menu is a mix of Zen's clean UI and Firefox's old about:preferences bones bolted together. Functional, but obviously transitional. Sync between two installs uses Firefox Sync directly, which works, but you can't easily share workspace layouts across devices yet.
The bigger concern is sustainability. Zen is built by a small team (the about page lists fewer than 20 contributors) on top of Firefox releases. If Mozilla's release cadence stays steady, Zen will stay current. If anything changes upstream, Zen could lag. That's just the reality of being a fork.
Should you try it?
If you're a Firefox user who's gotten tired of how Firefox looks but doesn't want to leave the Firefox extension world, Zen is the easiest test you can run. Download it, import your profile, use it for a week. If you bounce, Firefox is right there.
If you're coming from Chrome, the adjustment is bigger. Vertical tabs and keyboard-driven workspaces have a learning curve that takes about two days to click. After that, going back to Chrome's horizontal tab strip feels weirdly cluttered.
I'm not promising I'll still be using it in six months. Beta browsers are a known commitment trap. But after a decade of Firefox-with-the-same-defaults, this is the first thing that's made the browser interesting again. That alone is worth the install.
