Catalysis of the reaction: methyl (2E,6E)-(10R,11S)-10,11-epoxy-3,7,11-trimethyltrideca-2,6-dienoate + H2O = (2E,6E)-(10R,11S)-10,11-epoxy-3,7,11-trimethyltrideca-2,6-dienoate + methanol. A carboxylesterase that hydrolyzes the ester linkage of juvenile hormone.