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Best Sindup Alternatives
Here are some Firefox add-ons that are similar to Sindup:
Innguma Buttons
Innguma developer
19 5.00 
(1) 
INNGUMA Buttons
Innguma
2 0.00 (0) 
Changedetection.io Website Monitor
Changedetection.io webpage change detection
1 0.00 (0) 
IntSights Extend
Gal Ben David
- 0.00 (0) 
Site Spy
Vitaly Kuprin
19 5.00 (1) 
Inoreader Browser Extension
innologica
4K 3.49 (70) 
Siimpl Bookmarking
Siimpl
- 5.00 (1) 
Sitedux
Paul Kohler
- 0.00 (0) 
ColibriMonitoring
Rzubakov
- 0.00 (0) 
Aginsi - AI Summarizer & Research Toolbar
Alburn Technologies
8 1.00 (1) 
Sinclify
Andrea De Masi
2 0.00 (0) 
affilinet Extension
affilinet GmbH
8 3.67 (3)