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Best PageSpeedOff Alternatives
Here are some Firefox add-ons that are similar to PageSpeedOff:
Fast Page Mode
Bern
44 5.00 
(1) 
Google Page Speed Checker
J88
1 0.00 (0) 
Speed Score Viewer
Osian
- 0.00 (0) 
Speed Tweaks
Bắn Cá 79King
2 0.00 (0) 
Page JavaScript Toggle
vmarks
3 0.00 (0) 
Enable/Disable Browser Cache
Diogo Ribeiro
55 3.00 (1) 
Web Optimizer DOS
farmer
2 0.00 (0) 
Turbo Mode
Bern
42 0.00 (0) Disable Page Visibility API
Frank Dreßler
7K 4.72 (47) 
Focus Mode Toggle
Juniper
- 0.00 (0) Quick Dark Mode Toggle
FB88
- 0.00 (0) 
Speed Tweaks
Benthum
812 3.57 (35)