Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• Press and hold Shift and left-click the Reload button.
• Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• Press "Cmd + Shift + R" (MAC)

Clear the cache and the cookies from sites that cause problems.

"Clear the Cache":

• Firefox > Preferences > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Firefox > Preferences > Privacy > Cookies: "Show Cookies"

Start Firefox in Safe Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.org/kb/Safe+Mode

I tried those things already, cor-el, but it didn't help.

I cleared cookies, cache and history. In Safe Mode, the web site still will not load.

If you open the Web Console (Tools > Web Developer > Web Console; Cmd+Shift+K), do you see any successful requests to load files from the server if you do a hard reload?

Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• Press and hold Shift and left-click the Reload button.
• Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• Press "Cmd + Shift + R" (MAC)

• https://developer.mozilla.org/en/Tools/Web_Console
• https://developer.mozilla.org/en/Using_the_Web_Console

In the Web Console, I see a lot of entries with the words: Declaration Dropped.

There are a few with the words: Expected media feature name but found '...'

One has the words: Ruleset ignored due to bad selector.

I opened the page with problems, and pressed Command+Shift+R. The page reloaded, but with the same problem.

You need to check the Net log to see if the content is loaded normally.
You can (temporarily) hide all other messages in the Web Console panel via the buttons.

Is this what you mean?

I found this:

Expected color but found ';'. Error in parsing value for 'color'. Declaration dropped.

Here's the html code:

table.mainbody a:link {color: #6699FF; }
		table.mainbody a:visited {color: #6699FF; }
		table.mainbody a:hover {color: #CC99FF; }
		table.mainbody a:active {color: #6699FF; }
		table.maintop a:link {color: #6699FF; }
		table.maintop a:visited {color: #6699FF; }
		table.maintop a:hover {color: ; }
		table.maintop a:active {color: #6699FF; }
		table.mainheadline a:link {color: #6699FF; }
		table.mainheadline a:visited {color: #6699FF; }
		table.mainheadline a:hover {color: ; }
		table.mainheadline a:active {color: #6699FF; }

There is not supposed to be a hover color for that text on those pages. The hover color only applies to links on the page. If that was the problem, then why would others using Firefox 14.0.1 be able to view the pages fine?

Have you given up on me, cor-el? That's okay.

I'll just be using Safari. Everything works fine with it.

Thanks for trying to help!  :-)