Hi, try deleting ALL references to the website in question. To do that, open the 3-bar menu, choose History (looks like a clock), then click the Show All History link at the bottom of the list to open the Library window. Search for the website you want to clear by typing its name in the Search History field in the top-right corner, then press Enter. Now in the search results, right-click on the site you want to remove, 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

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Yippee I'm out. Many many thanks Scribe.

@Grobtutor :

You inadvertently marked your own post as   'Chosen Solution,   instead of   Scribe's. You can rectify that by clicking the   Undo   button on the right sight of your post, and then mark   Scribe's   post as   'Chosen Solution'. Would you be a dear and do that please   ? Thank you in advance   !

Clearing active log in's does not work

Note that you need to clear the cookies from this website and not active logins as this is something different.

You can remove the cookies from a website to make the website forget about you.

Thanks to all for your help, the problem is now solved.