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by pbzm 704 days ago
We've fixed this issue on the Firefox side ~2 months ago. Here is the bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1897379

It's possible that you have an extension installed that blocks e.g. Twitter's CDN. We've seen issues like that with the Disconnect Firefox extension.
2 comments
anticensor 704 days ago
This fix is no longer relevant as they no longer use twitter.com as of later today.
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matteocontrini 703 days ago
Source? I can still use twitter.com normally on Firefox.
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renonce 704 days ago
So if I understand correctly, this puts x.com under the same entity as twitter.com so third party cookies are allowed between x.com and other twitter sites?
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pbzm 704 days ago
Firefox partitions (and soon blocks) 3rd party cookies by default. That means they can't be used for cross-site tracking. Also not across different top level sites belonging to Twitter / X. The entity configuration for ETP does not change anything here.

The bug we fixed was in ETP, an older mechanism in Firefox, which blocks cookie access for known trackers, based on a list. Only for that mechanism we consider a hand full of domains by Twitter / X to be the same party. This is so we e.g. don't block their CDN if you're on x.com. We still block them on sites not belonging to Twitter / X. This is especially relevant for ETP strict which does not only block cookie and storage access, but also blocks 3rd party loads from known trackers altogether. If we block Twitter's CDN on x.com the site breaks.

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