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Best Mainframe Alternatives
Here are some Firefox add-ons that are similar to Mainframe:
Blue in black
s_a_onoprienko
- 0.00 
(0) 
Lime Purple
Carl Sagan
1 5.00 (1) 
Green and Blue
s_a_onoprienko
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Terminal (Green)
Fallen Dragon
- 5.00 (1) 
Main
Firefox user 14335525
- 0.00 (0) 
Terminal Green 2.0
DeRMuStAnG
1 0.00 (0) 
retro computer
deltadada
1 0.00 (0) 
GreenTextGreyBG
iStatiK
- 4.00 (1) 
Dark Green Basic
Dominik Rastner
5 0.00 (0) 
Matrix Terminal
BKo
1 4.00 (1)