This could be related: a problem has been reported with the FlashBlock add-on preventing sites from storing settings such as "Flash cookies." I don't know that Yahoo and/or AOL uses such a cookie, but if you have FlashBlock or any similar add-on that allows you to selectively block Flash, try disabling it temporarily and see whether that has any effect.

More generally, it may be that one or more of your add-ons is not fully compatible with Firefox 13. Could you try Firefox's Safe Mode?

First, I recommend backing up your Firefox settings in case something goes wrong. See Backing up your information. (You can copy your entire Firefox profile folder somewhere outside of the Mozilla folder.)

Next, restart Firefox in Safe Mode using

Help > Restart with Add-ons Disabled

In the Safe Mode dialog, do not check any boxes, just click "Continue in Safe Mode."

If the sites operate correctly -- you might need to re-enable Flash in order to fully test -- this points to an add-on or custom setting as the likely problem.

Thank you so much for your reply jscher2000. It means a lot to get any suggestions when so desperately in trouble. I checked but do not have a FlashBlock add-on and, I kept researching and trying different things. The problem ended up being a change that occurred in the settings of how Firefox connects to the internet. I believe this was caused in the course of the update download but, cannot tell for sure as it may also be related to addware, filtering, cache, cookies management, etc. The solution was to go to Tools -- Options -- Advanced -- Network -- Connections/Settings where I had to check the No Proxy option under Configure Proxies to Access the Internet. All is well and working again now! Maybe this will help someone else too.

"The solution was to go to Tools -- Options -- Advanced -- Network -- Connections/Settings where I had to check the No Proxy option under Configure Proxies to Access the Internet."

Thank you very much! The problem occurred for me in the form of getting the message, "We noticed you may have signed in or signed out in another window. Click OK to reload your page." Other Yahoo users have complained about this, and for me, it started with the release of version 13. I had reverted to 12 to solve it, but now, thanks to your comment, I'm updated and it works. I hope your post can get a little more visibility as being the solution to this problem.

Glad to hear my solution helped you Farmie.

Cybercris,

It did help me. I don't know why my answer was chosen as the solution, as it was your information. At any rate, I do appreciate your help.