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Best OnScreen Alternatives
Here are some Firefox add-ons that are similar to OnScreen:
Screens on screen
Dom974
- 5.00 
(1) 
Screen
Belvarius
- 0.00 (0) 
Broken Screen
Oneway
- 0.00 (0) 
Splash Screen
gerryfx
- 0.00 (0) 
LovelyScreen
SallyBelly
- 0.00 (0) 
Elegant Screen
Dom974
1 3.50 (2) 
YellowScreen
triplecharbon
1 0.00 (0) 
screen-view
g650609
- 0.00 (0) 
Black Screen
Firefox user 10148518
8 5.00 (1) 
airscreen2
assistant10
- 0.00 (0) 
airscreen3
assistant10
1 0.00 (0) 
Screened Window
justkay
- 0.00 (0)