It appears that when using the plugin in Firefox 20+ (Not sure about previous versions) with JQuery UI (both 1.9.2 and 1.10.2), animating (or in my case, toggling a class with animation) causes the element to set the wrong values, and toggling no longer works after using it once.
A basic reproduction of the page with navigation/content CSS and javascript as used: http://jsfiddle.net/Xhz8d/
The left-hand side navigation's element after toggling in firefox (from the inspector):
It appears that when using the plugin in Firefox 20+ (Not sure about previous versions) with JQuery UI (both 1.9.2 and 1.10.2), animating (or in my case, toggling a class with animation) causes the element to set the wrong values, and toggling no longer works after using it once.
A basic reproduction of the page with navigation/content CSS and javascript as used: http://jsfiddle.net/Xhz8d/
The left-hand side navigation's element after toggling in firefox (from the inspector):
Chrome:
Screenshots of the problem in firefox (before/after toggle) and what it should look like (in chrome):
![chrome - after toggle](https://f.cloud.github.com/assets/188480/383275/6832d5b6-a612-11e2-8ff7-28d1c83c4e62.png)