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Best Web Overlay Alternatives
Here are some Firefox add-ons that are similar to Web Overlay:
Behind The Overlay
Nicolae Namolovan
16K 4.58 
(78) 
Fullscreen On Load
Itaru
14 0.00 (0) 
Pinned Sidebar
tanukizzan
3 5.00 (1) 
Image URL Overlay
David Cordero
- 0.00 (0) 
Quick floating web calculator
webcalculator
1 0.00 (0) 
Weather Overlay
789club
- 0.00 (0) 
Fullscreen
Mark Tiedemann
269 4.19 (21) 
Behind The Overlay Revival
Iván Ruvalcaba
3K 4.39 (79) 
HTML Capture
stageleft
1 0.00 (0) 
Multi Sites Viewer
EggSystems Inc.
2 0.00 (0) Smart Whiteboard Overlay
Mr Raymond
1 0.00 (0) 
Fullscreen Plus
Trishul
1K 3.51 (69)