Try clearing your cache. See How to clear the Firefox cache

Yes I did I always clear it

Does it happen on all sites or just specific ones? Can you give us an example address?

All. EX Farmville on Facebook. EX: I only see half of the image of the boy here: http://www.msnbc.msn.com/id/9646449/ns/health-kids_and_parenting//#storyContinued

If I try that website in Safari (I'm on Mac) I see the same thing. (screenshot attached)

msnbc has a tendency to code their pages only for Internet Explorer. Try sending a complaint to them. Sorry there isn't more that can be done on your end.

looks like the screenshot was to big for the forum to accept. I've resized it and am attaching it to this post

What about Farmville app? I never had the problem before until I updated FF.

If you close Firefox, then start Firefox in Safe Mode, does the problem still occur? For instructions on starting in Safe Mode, see Diagnose Firefox issues using Troubleshoot Mode.

Reset the page zoom on pages that cause problems: View > Zoom > Reset (Ctrl+0 (zero); Cmd+0 on Mac) See Font size and zoom - increase the size of web pages and Font size and zoom - increase the size of web pages and http://kb.mozillazine.org/Zoom_text_of_web_pages

Yes Chris and already tried it cor-el.

PS seems to be ok now since the newest update... (CROSSES FINGERS)

The (Managing the Flash plugin|Flash plugin)) (which I think Farmville may use) has its own cache, so maybe it was a case of that cache needing to be flushed.