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Best SimplyFocus Alternatives
Here are some Firefox add-ons that are similar to SimplyFocus:
Focus Lock
Roberto Esparza
13 4.00 
(1) 
Focus Blocker
SUNWIN
3 0.00 (0) Focus Blocker
123WIN
- 0.00 (0) 
focuscape Website Blocker
focuscape
3 5.00 (1) 
Distraction Block
Ember Extensions, LLC
23 4.00 (4) Focus Blocker
mdlnlss
1 0.00 (0) 
Focus Arrow
Gary Hilares
2 5.00 (1) StayFocusd Lite
stayfocusd
35 0.00 (0) 
Focuzr
Firefox user 14163118
7 5.00 (2) 
FocusNuke
rajesh surapuraju
1 0.00 (0)