I am running Quantum. Follow these instructions: https://github.com/gorhill/uMatrix/wiki/How-to-block-1st-party-scripts-everywhere-by-default https://github.com

I am running Quantum. Follow these instructions: https://github.com/gorhill/uMatrix/wiki/How-to-block-1st-party-scripts-everywhere-by-default https://github.com/gorhill/uMatrix/wiki/How-to-block-1st-par... but select the cookie column instead and they will be blocked until whitelisted.