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Cannot remove persistent site data from Manage Data under Privacy & Security

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I have a MacBook Pro running Sequoia 15.3.2. When I remove all data from Firefox (137.0 (aarch64)) in Manage Data under Privacy & Security there is one site datum that always returns. It is 64k of data, 0 cookies, that persists after every clean up. This has been going on for quite a while.

I've searched Finder for any reference to the company name and cannot find any reference.

It isn't a lot of data, but I'd prefer to not have something lingering around.

Does anyone have a suggestion for how to delete this once and for all?

I have a MacBook Pro running Sequoia 15.3.2. When I remove all data from Firefox (137.0 (aarch64)) in Manage Data under Privacy & Security there is one site datum that always returns. It is 64k of data, 0 cookies, that persists after every clean up. This has been going on for quite a while. I've searched Finder for any reference to the company name and cannot find any reference. It isn't a lot of data, but I'd prefer to not have something lingering around. Does anyone have a suggestion for how to delete this once and for all?

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