Firefox does weird things. Both versions, Windows and Mac. Apart from using up 95-99% of my CPU within fifteen minutes to half an hour of opening it (which I won't fault it too hard for, as it seems even Chrome and Safari does this now and much more annoyingly, ugh), it does things sometimes like not showing me images on pages, when the images are definitely linked correctly.
In fact, I can go directly to the image URL and it'll load up fine, but on pages they won't show at all. I can look at the image under Page Info and it'll be like: broken! This has happened with a select few of my own hosted pictures on my own websites, and a few from Photobucket... they show up in other browsers. c_c