I just started to help maintain our school's website found here: http://www.hawaii.edu/eall/
The problem is that when a Mozilla browser enters the site with https our navigation bar explodes to the whole screen and displays itself vertically and you can no longer see the header. It rarely happens in Chrome and works perfectly in other browsers. For example visit the site using this instead: https://www.hawaii.edu/eall/
In order to fix it in Mozilla, we've had to tell users to click the padlock near the URL and "disable protection for now" (so that they are now under http and not https) in order for the page to display normally.
What could possibly be the problem? Initially I was thinking it might be the plugins but I'm not too sure since I'm fairly new to WordPress. Any piece of advice would be greatly appreciated. Thanks in advance!