Pretty nice.

Good thing I have Firefox. Using Tree Style Tabs and a few accompanying extensions, I can group my tabs the way I like, fold / expand groups and subgroups, rearrange, etc.

Using the Auto Tab Discard extension, I can keep rarely-used tabs offloaded from RAM, so having 200 tabs is not a burden any more.

I can also open several Firefox windows, and move tabs around to form topic groups, for instance. I can drag whole tab subtrees between them, or send them via a context menu. Another extension allows me to name windows, and my window manager is good at tiling or snapping windows together.

It's great that Arc offers a guided and pampered experience like that. It's also great that I can have it using open source products for free.