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So if you are using container tabs to prevent cross-site tracking, then they probably only adds fingerprinting vector (probably a rather small one though, as these extensions do not change the contents of the site).
I don’t think facebook can snoop on firefox these days. Firefox has already isolated all third party cookie and site content by default:
So if you are using container tabs to prevent cross-site tracking, then they probably only adds fingerprinting vector (probably a rather small one though, as these extensions do not change the contents of the site).