Tab Groups with Panorama View Add-on for Firefox 57+
https://addons.mozilla.org/en-US/firefox/addon/panorama-view/
- Create and remove groups
- Drag and drop tabs between groups
- More solid thumbnailing
- Double checking that the active group in a window is always set and valid
- Fix up renaming of groups
- Backups (Waiting for API) Import works, but creating windows and tabs correctly isn't really possible right now (can't open about: urls, etc)
- Different views of the groups
- Automatic with thumbnails
- Manually resizable/movable groups with thumbnails (set tab view type per group (thumbnails, list))
- List view with vertical lists (scrollable)
- Dark theme
- Make new group and set active when you delete last group in a window
- Drag and drop tabs and groups between windows (maybe)
- Tab and tab-strip hiding (coming in v59)
- Import/restore backup
- Properly open backup urls (maybe)
- Attached tab isn't added
- Detached tab not always removed