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.
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.