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Best Window Sill Alternatives
Here are some Firefox add-ons that are similar to Window Sill:
Tab Sync Lite
Ompio
19 5.00 
(1) 
Sync Saved Windows
Richard Wong
9 5.00 (3) 
Sync Tab Groups
Marmotz
34 5.00 (2) Synced Tab Groups
Sefko
45 0.00 (0) 
Auto Tab Sync
Sasha
1 0.00 (0) Window Saver v1.7
piyush1104
1 1.00 (1) 
Synchronize Tab Scrolling
jaem1n207
73 5.00 (2) 
Pinned Tab Sync
Joofthan
20 0.00 (0) 
TabSync
thuquan_developer
1 0.00 (0) Share Tab
mdonlan
4 2.00 (1) Tab Focus Sync
ATClus
- 0.00 (0) 
Window Saver
jonhac
145 3.86 (14)