Honestly, it sounds like Arc doesn’t add much beyond firefox + an extension that utilizes the built-in sidebar. I signed up for the beta then never got round to testing it. After reading about its amateur security flaws I was glad for my laziness.

I’ve been switching between sideberry, tab stash, tab session manager, and tree style tabs for years. All of them feel like they fulfill most of what was described in this article, except you get container tabs, which are superior to workspaces.

My main complaints with Firefox are Mozilla corp, and profile/config management. I’m not dumb enough to think switching to “the browser company” corp will solve the first problem, and it doesn’t sound like Arc is anywhere near solving the second.