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Tab groups only provide a visual way of grouping tabs purely for organization & tab management considerations. Containers actually separate things like cookies, browsing history, etc. so that the APIs that let you query that in a web app only see things related to the domain of that container, i.e. the sites you have open in it. Containers are actually less of a protection now that Firefox separates cookies and stuff even outside of containers, but they still help break up tracking cookies, etc, so that you maintain a little more privacy than you'd have otherwise. Tab groups do nothing for privacy
right so the auto-grouping of containers that TST has had for years is basically the same thing.
Just curious, what is TST?
[EDIT: oh, tree-style-tabs, got it. Given that, the rest of my comment is superfluous]
But I think there's more to tab groups than what containers provides. You can't collapse all the tabs in one container down into a small representation of that group, for instance. Nor does it provide for a mechanism to move all the tabs in one group together along the tab bar, and reorder entire groups among other groups.
I think their concerns are orthogonal. The only really similar thing about them is that containers use a color coding visual style similar to tab groups. They lack a lot of the niche features that make tab groups really sing