Browser tabs are quite a hard problem actually that many have tried to tackle - and many failed.

In my firefox days I have tried just about every tab-addon there is, from coloring (with or without aging), over multi-row, to tree-sidebar. None of them did improve the situation enough. In summary the multi-row variant helped the most, but the tab-ordering would still get messed up constantly with unrelated tabs slipping into places where they don't belong (the dreaded "spontaneous google search").

And one thing is for sure, the firefox default of scroll-arrows on the tab bar is probably the worst from all worlds. The chrome-way of squeezing it all into whatever width available beats that hands down, but still leaves a lot to be desired.

So, as someone who routinely has 30+ Tabs open in supposedly distinct groups ("Work", "Procrastination", "Research" etc.) - this looks very promising to me.

Ideally I'd want this in a slideout side-panel. And in chrome, ofcourse. ;-)

Typically I open a new browser window for these sort of groups (work, fun, etc). If a tab needs to move between these ad-hoc groups then with chrome you can of course just drag it between the windows. Since I have a 3 monitor setup this is a no-brainer. The tab-candy setup would be less efficient in this regard because I have to open a third state to arrange tabs. However, if I was forced to work on a laptop this might be a better option than my current setup.