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Best Viewport (beta) Alternatives
Here are some Firefox add-ons that are similar to Viewport (beta):
Popout
Space City Software, L.L.C.
275 3.33 
(3) 
Popup To Tab
em_te
500 4.55 (11) 
One Tab per Window
Nate
9 5.00 (1) 
Simple Momentum New Tab
momentum
1 0.00 (0) 
Fullscreen
Mark Tiedemann
291 4.19 (21) 
PopUp
aqt
932 4.74 (43) 
Popout Tab!
NonsenseInc
14 5.00 (2) Send Tab To
cr
15 4.50 (2) 
Custom Window Resizer
GenXJay
36 0.00 (0) 
Auto Minimize Tab Groups
yoneo
23 5.00 (1) 
Tab Workspaces
Fonso
691 2.82 (65) 
Detach Current Tab
Szwarceneger16
1 5.00 (1)