what file format does firefox use?
Entity
m.02y7ld
OpenDocument
class entity
computer.file_format m.01dyhm
computer.file_format computer.software
File Format Firefox
none none
computer.file_format.written_by
Written By
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :computer.file_format . 
VALUES ?x1 { :m.01dyhm } 
?x0 :computer.file_format.written_by ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND computer.file_format (JOIN computer.file_format.written_by m.01dyhm))