Hi, try deleting ALL references to Yahoo mail. To do that, open the 3-bar menu > Library > History, then click the Show All History link at the bottom of the list to open the History-library window. Search for Yahoo in the Search History field in the top-right corner, then press Enter. Now in the search results, right-click on it, and select Forget About This Site. (Browsing and download history, cookies, cache, active logins, passwords, saved form data, exceptions for cookies, images and pop-ups for that site will be removed). Give it a minute to complete the deletion, then try the site (not from an old bookmark) again. More - [[Delete browsing, search and download history on Firefox]] ''If your question is resolved by this or another answer, please take a minute to let us know. Thank you!''