Dynamic elements don't render properly, twitter, facebook, etc.

Question

Most simple webpages load just fine, but anything with dynamic content, sticky menu bars, text inputs that scroll, and other elements don't render properly. They load and then immediately disappear leaving just white space. Some sites will return eventually or load if scrolled to a certain point on the page. Other pages are fine on load but then once menus are loaded or the page is scrolled to a certain point the content disappears, only to return when the page is scrolled back to the top or the menu is closed.
For example, none of the divs on Twitter display content unless I scroll down about two page heights. Alternatively, my Facebook feed loads just fine until I start to scroll down, at which point the side bars and chat window lose content periodically. Now that I've typed enough in this text field to necessitate scrolling, I lose content if not at the top of the box. I had to stretch the field in order to eliminate scrolling.
I am running Firefox 30 on MacOSX 10.8.3. The issue does not present in Safari or on other computers on the same network with the same setup. I have tried clearing the cache, clearing cookies, updating Firefox, resetting Firefox, reinstalling Firefox, updating Flash, and updating Java.

Answer 1

Many site issues can be caused by corrupt cookies or cache.
* Clear the Cache
'''[https://support.mozilla.org/en-US/kb/how-clear-firefox-cache How to clear the Firefox cache]''' {web link}
and
* Remove Cookies
'''''This will log you out of all sites you're logged in to.'''''
Press the '''Alt''' or '''F10''' key to bring up the tool bar.
Followed by;
Windows; '''Tools > Options'''
Linux; '''Edit > Preferences'''
Mac; ''application name'' '''> Preferences'''
Then '''Privacy.'''
Under '''History''', select Firefox will '''Use Custom Settings'''.
There is a button on the right side called '''Show Cookies'''.
If there is still a problem,
'''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]''' {web link}
While you are in safe mode;
Press the '''Alt''' or '''F10''' key to bring up the tool bar.
Followed by;
Windows; '''Tools > Options'''
Linux; '''Edit > Preferences'''
Mac; ''application name'' '''> Preferences'''
Then '''Advanced > General.'''
Look for and turn off '''Use Hardware Acceleration'''.
Poke around safe web sites and see if there is still a problem. Then restart.