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Best Opera Theme Alternatives
Here are some Firefox add-ons that are similar to Opera Theme:
Firepera
Unnat Shaneshwar
2 5.00 
(1) 
Opera Dark theme
Tibor
1 4.00 (1) 
Opera GX theme
Anand Johnson
- 0.00 (0) 
Opera GX theme for FF/WF/LW
seadragon420
1 0.00 (0) 
Opera 58 Light
Terg500
1 5.00 (1) 
Opera Dark
Nuterbuter67
- 0.00 (0) 
Opera Dark inspired
Firefox user 13360870
- 0.00 (0) 
Mozilla Firefox- Theme
Sujan Shrestha
10 5.00 (3) 
Opera 10 Theme
tymerkaev
- 0.00 (0) 
Opera GX Light
TheJanox824
- 0.00 (0) 
Opera Light Theme
Zaeem
11 0.00 (0)