Has anyone ever seen this type of issue in Firefox? This is one of the slides in our slider UL, and in order to make it responsive we're using jQuery to set the width of the individual slides and the width of the entire strip of slides. It works perfectly fine in Chrome and Safari and larger screen sizes in Firefox, but when it gets to 990px, the slides stop changing width and get stuck at 990, even with the inline style of 616px in this screenshot of the Firefox Computed Styles panel.

Does anyone have any clue as to why this is behaving this way?