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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) 
Social Previewer
social preview
2 0.00 (0) 
OpenGraphs
Commune Software
22 5.00 (1) 
OGraph Previewer
789WIN
7 0.00 (0) 
Open Graph Previewer
Ruben
29 0.00 (0) Meta tags inspector
Numer
301 4.75 (4) 
Open Graph Preview
apiaget
2K 4.00 (12) 
Metaview
Tim Heap
92 4.33 (3) 
Highlight Heading
Danil
11 0.00 (0) 
OGPreview
Filmp
31 0.00 (0) 
Feel-the-Link
Novs Yama
1 0.00 (0) 
Headup Shine
EranSun
- 0.00 (0)