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Best Heads Up Alternatives
Here are some Firefox add-ons that are similar to Heads Up:
OG Previewer
DAVID POWER
2 0.00 
(0) 
Open Graph Checker
Coywolf
3 0.00 (0) 
Social Previewer
social preview
1 0.00 (0) 
OpenGraphs
Commune Software
23 5.00 (1) 
OGraph Previewer
789WIN
7 0.00 (0) 
Graphcheckr
ShadowNine
- 0.00 (0) 
Social Open Graph Preview
social graph
- 0.00 (0) 
Open Graph Previewer
Ruben
27 0.00 (0) 
SEO Inspector
Alanas
1 0.00 (0) Meta tags inspector
Numer
287 4.75 (4) 
Peek - Design & Asset Toolkit
Khalid Hasan Zibon
15 0.00 (0) 
Open Graph Preview
apiaget
2K 4.00 (12)