This problem started a few weeks ago, after reinstalling my operating system (Windows 8) and thus a fresh install of Firefox. After adding the Pinterest Pin It button, which always worked fine for me before, I found it didn't always work as intended. The biggest problem with its functionality is that it seems to "miss", for lack of a better word, a lot of images and videos on sites, especially the big/main ones, and only shows me the thumbnails from sidebars and that sort of thing. Not 100% of the time, sometimes it finds them, but it no longer displays them right so it's hard to tell which is the image I want - they'll all look like tiny postage stamps, or some images will be mostly cut off so I only see a fragment of it, like it didn't adjust the size right for the popup display. Less important for the functionality but possibly linked, the background is an intense, flat red. Is this a graphics display issue, or am I perhaps missing a plugin of some sort?