Compass single-transition mixin not working in Firefox 22

I'm using Sass 3.2.9, Compass 0.13.alpha.4, and Susy 1.0.9 on this project. Here is the scss: ``` .callout-image-wrap { @include single-transition(border-color, .5s, ease-in-out, 0); @include rem(border-bottom, 5px solid $mxn-light-blue); &:hover { border-bottom-color : $mxn-dark-blue; } } ``` and here is the generated css: ``` .callout-image-wrap { -webkit-transition: border-color 0.5s ease-in-out; -webkit-transition-delay: 0; -moz-transition: border-color 0.5s ease-in-out 0; -o-transition: border-color 0.5s ease-in-out 0; transition: border-color 0.5s ease-in-out 0; border-bottom: 5px solid #0099ff; border-bottom: 0.3125rem solid #0099ff; } .callout-image-wrap:hover { border-bottom-color: #003399; } ``` It doesn't look like FF is even picking up the transitions. Yet, it is working just fine in Chrome. Was there a change in the way Mozilla prefixes transitions? Or maybe in how Compass is generating them? Or am I writing it wrong? I also tried doing: ``` @include transition(border-color .5s ease-in-out 0); ``` I've used this mixin on past projects without issue, so I'm pretty stumped on this one.