After install go to "Filter Lists" > Import ... > and add the url of the "list"... which is actually from a different repo: https://gitlab.com/magnolia1234/bypass-paywalls-clean-filter...
Note: this apparently works for fewer sites than the linked extension.
It used to be in mozillas addon store, but they removed it, so have to install via dev mode
https://gitlab.com/magnolia1234/bypass-paywalls-clean-filters/-/raw/main/bpc-paywall-filter.txt