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Best Open Existing Alternatives
Here are some Firefox add-ons that are similar to Open Existing:
Open Previous Page in New Tab
Elias Jaffe
3 4.50 
(2) 
Open Multiple URLs
ht
18K 4.54 (100) 
Open Right Beside
igorlogius
19 5.00 (6) 
Open Link in Immediately Adjacent Tab
jscher2000
38 5.00 (4) 
New Tab Here
pollti
24 5.00 (6) 
Tab Control
czukowski
177 4.59 (22) 
Tabs Aside
Tim Weißenfels
419 4.23 (53) 
Open Tabs Next to Current
Sebastian Blask
6K 4.56 (179) 
Close All Same Origin Tabs
igorlogius
- 0.00 (0) 
Open Links in Tabs
André Veríssimo
1K 4.10 (29) 
Tab [a]123bc
Alexandre Bouvier
12 5.00 (2) 
Open Tab Right, Close Tab Left
T444W
1 0.00 (0)