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Best Sigmund Alternatives
Here are some Firefox add-ons that are similar to Sigmund:
Procrastination Friction
Matt
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NoProcrast
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StopProcrastination
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Anti-Procrastinator
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2 0.00 (0) 
Website Limiter
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82 4.33 (3) 
Wait a Minute
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deprocrastination - block sites
deprocrastination.co
44 4.00 (8) 
Procrastination Timer
kristofferfj
2 0.00 (0) 
Dawdle Block
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14 4.90 (10) 
ZenGuard: Block Website Stay Focused
shawn
9 0.00 (0) 
Time Snatch - Block Websites with Timers
Grounded Momentum
741 5.00 (9) 
SiteBlocker: Easy Blocking and Scheduling
LionByte Software SRL
63 0.00 (0)