Tab Groups are practical to organize tabs into logical groups, however, it is difficult to store the groups away when they're not needed for the time being, and just taking up space.
This video is a demo of a proposed feature for Google Chrome (and Chromium), that lets people save the tab groups for later, and supports restoring those tab groups when needed again. This is a project I've worked a while ago. The feature is implemented directly in the codebase, not as a plugin or an add-on. Note this functionality is not part of the standard Google Chrome yet.
Saving tab groups for later is a highly requested feature: https://support.google.com/chrome/thr....
Source code: https://chromium-review.googlesource....
Project status: the feature is largerly working, but needs some more work to support certain scenarios and rule out certain bugs.