Hi, please see under the heading 'How do I remove a single website from my history?' in this article - Delete browsing, search and download history on Firefox, and remove all references to that website.

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Shoebox said

For the past week I have been unable to log into my Sainsburys shopping account using firefox. Sainsburys said it was due to Firefox.

Sainsburys are having a software problem with Firefox and are still working on it.