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Yahoo mail

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Today for the first time, my BT Yahoo mail would not open and BT states to check log in details. All seem correct and new password application along with restarts shows the same message. I contacted BT and they say everything is working but will upscale to their Boffins. I can get into my mail now via other browsers but NOT FIREFOX. What is causing this in FIREFOX?

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First, a common problem that users encounter with Yahoo! mail is that Yahoo changed their server. If you are using an old bookmark or old home page address to access your mail, try using this more general address so that if your server changed, you get redirected to the new servers:

If that doesn't make any difference, here are some general things to try:

When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

(1) Clear Firefox's Cache

(2) Remove the site's cookies (save any pending work first). While viewing a page on, try either:

   right-click the page and choose View Page Info > Security > "View Cookies"
   (menu bar) Tools > Page Info > Security > "View Cookies"
   click the padlock or globe icon in the address bar > More Information > "View Cookies" 

In the dialog that opens, you can remove the site's cookies individually.

Then change the address at the top of that dialog from to to see whether there are any additional cookies to clear.

Then try reloading the page and logging in again. Does mail work?