Tried a few tap group / dedupe / sort tab addons but this has the most intuitive simple UI, small size, that does exactly what you need and nothing more.

A few things I'd wish to be able to configure is:

1. For "sort" to sort by subdomain, then by title (rather than url)
2. For "group" to not group single tabs.
3. A "live" mode which automatically dedupes tabs (helpful when opening several identical links) and sorts them.