how did you "check" them?
mounts may or may not show visible signs of wear. But if you've got a 13-year old Focus that still has factory mounts, then it's a safe bet that that's your vibration problem.
It's a frequent topic on this forum, so use the search box and you'll find some useful threads discussing Ford vs. aftermarket mounts.
"I'm jealous of girls because they get to wear dresses." (Todd Flanders)