Update: The Google SF office, half a block away from Mozilla, has one too:
When Worlds Collide
Apparently the conference rooms in the Mozilla SF office are all named after bars and nightclubs, and so this happened: 
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Tags: dnalounge, fanboys, firstperson, nscp, sf
Location: 37° 47' 25.20" N, 122° 23' 25.80" W