Chicago (10-11-6) has earned only two points in its last three matches and missed a chance to move into a playoff position in the Eastern Conference. The Fire is one point behind New England and Houston, who are tied for the conference's No. 5 spot.
Dilly Duka gave Chicago the lead in the 20th minute, but Earnshaw quickly tied the contest.
Toronto, which has only four victories in 28 matches this year, is in next-to-last place in the East.
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