Why css slows down the transition property in Firefox browser?

Question

css

Why css slows down the transition property in Firefox browser?
It seems to go with jerks-lags, on other browsers, it works out as expected

-webkit-transition: all 0.4s ease-out;
  -moz-transition: all 0.4s ease-out;
  -o-transition: all 0.4s ease-out;
  transition: all 0.4s ease-out;