I've tried using Firefox on my laptop, desktop, and work computers, and the site just... doesn't look and feel the same. Most of the graphics don't show up, everything's grey. What's going on?

i'm using FF right now

Screen capture? Sounds like a problem on your end, maybe a setting or blocked the wrong server?

I've always used firefox and haven't had any problems ... I'd say check your FF settings but unless you changed something on all the computers I don't know what it is, especially if you are connected through different networks at home and at work

go to tools-extensions then find newest update.
Also get faster fox its a new update. https://addons.mozilla.org/extensions/moreinfo.php?application=firefox&category=Popular&numpg=10&id=1269