Firefox addons element blinks anonymously using CSS animation on Mac

The problem only occurs on Mac:

The "Test Link" item flashes abnormally when used in the Firefox addons panel (sdk / panel) compared to the JSFiddle demo , even though they share the same source code.

Firefox source code: https://drive.google.com/file/d/0BzHBWuszZv5_eWl1RTdIOW84NG8/view?usp=sharing

for start

download and unzip $ cd CSSFlashing3; cfx run

Is there a workaround for the problem because who knows how long it takes for Mozilla to fix this?