Did Firefox move to this site (I got linked here for "Find a Physician"):

http://www.providerlookuponline.com/uhc/po7/Search.aspx

Among your extensions, the only one I think could be an issue is Adblock Plus. Can you make an exception for that site in ABP, or disable ABP temporarily, and see whether that makes any difference?

In your system information, there's no information on preferences, so if something is blocked there, it's hard to comment.

I tried it but it still won't work.

You can try these steps in case of issues with web pages:

You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• Hold down the Shift key and left-click the Reload button
• Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• Press "Command + Shift + R" (Mac)

Clear the cache and remove cookies only from websites that cause problems.

"Clear the Cache":

• Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

• Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
• Do NOT click the Reset button on the Safe Mode start window

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

jscher 2000 - that link didn't work for me either.

MaryGoins - this seems to be the obvious one - http://www.uhc.com/find-a-physician Make sure you are not trying to access something where you need to sign in first.