This can be caused by corrupted cookies.

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

"Clear the Cache":

• Firefox > Preferences > Advanced > Network > Offline Storage (Cache): "Clear Now"

"Remove Cookies" from sites causing problems:

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

I followed your directions and removed all cache and cookies. Message is still there! Any other ideas??? Thanks

Still have not been able to fix the problem. Anyone out there have any other ideas?

Are you using a bookmark to go to a specific website or are you entering the page via the main home entry?

Try to login via the Yahoo! home page and navigate manually to the desired Yahoo! website.

yes if I go through Yahoo Mail I have access but still cannot open my mail using the bookmark. Any ideas on how I can correct that?? Thanks for your help.

Try to delete the current bookmark and see if a new bookmark works better.
If you keep having problems then you will have to use the longer route to arrive at your mail.

How do I delete a bookmark?

If you see a highlighted star in the location bar then you can click that star to remove the bookmark.

Otherwise you will have to locate the bookmark in the Bookmarks Manager (Library) and remove it there.

• Bookmarks > Show All Bookmarks

See:

• https://support.mozilla.org/kb/Deleting+Bookmarks

ok!! I had to delete all of my bookmarks (including yahoo mail) and start over but I no longer have the dreaded message on my firefox homepage. Thanks so much for the help!