TabGroupie by TabGroupie

TabGroupie automatically organizes your tabs by domain - useful if you keep too many tabs open.

Features:
- One-click grouping by domain
- Deterministic colors - each domain gets a stable color across sessions
- Smart focus - closing the active tab in a group keeps focus inside the group
- Duplicate detection (URL-normalized)
- Option to hide pinned tabs
- Automatic dark mode (Catppuccin Mocha)

Privacy: no data collection, no tracking, no remote requests. Everything stored locally.

Requires Firefox 139+.