Tab groups also exist in chrome, brave and edge (was behind a flag last time I checked), and presumably other chromium-based browsers too

I use tab groups on Edge. I consider it a killer feature.

I especially like the auto group feature. I start a search and every link I open in a new tab is added to the group (which is collapsible).

I do a lot of spec digging doe my work. It’s not uncommon to have 3 or 4 tabs per data type with many data types.

Since the app is launching on Apple's ecosystem, it also makes sense to compare to Safari where we're already getting tab groups and syncing.

Plus, there's the usual stuff of password management, email aliases (nice for not giving out your email), and private relay, which is basically TOR lite for grandma. And what about ad blocking?

And Firefox

I'm familiar with it as extensions, and not completely happy with any - lacking keyboard shortcuts, losing some of my tabs/groups, no synching across devices, multiple backgrounded tabs still running and killing performance and other issues.

Was it added to the core browser?