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Cookie “UploadForm” will be soon rejected because it has the “sameSite” attribute set to “none” or an invalid value, without the “secure” attribute.
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Description

https://commons.wikimedia.org/wiki/Special:Upload produces the following warning in the Firefox developer console:

Cookie “UploadForm” will be soon rejected because it has the “sameSite” attribute set to “none” or an invalid value, without the “secure” attribute. To know more about the “sameSite“ attribute, read https://developer.mozilla.org/docs/Web/HTTP/Headers/Set-Cookie/SameSite index.php:89:40

Event Timeline

Is that used by some gadget? I don't think MediaWiki sets such a cookie.

Although that script shouldn't need SameSite, and as far as I can tell isn't using it either, so not sure what's going on there.