I found a bug once in our content that only affected Firefox. Old versions of articulate whouldnt start properly. Not somthing I could fix on my own as i meeded anyoher department. I brought it to the attention of the managers. They didn't want to fox it as apprently Google analytics showed only .4% of our user base was using Firefox. I manged to convince them its part of our user commitment to ensure that we work consistently across all browsers, but it was a pain.