I believe the one you linked is the fork. Here is the original.
https://github.com/iamadamdev/bypass-paywalls-chrome
I recommend the fork you linked because the original author supposedly was slow and reluctant to add new sites and now copies fixes from the fork.
Read more about the history here: https://gitlab.com/magnolia1234/bypass-paywalls-firefox-clean/-/issues/1


















The ENG US is only shown if the user has multiple languages. As for the icons to the left of that, the user has manually chosen to always show them instead of having them in the overflow area. So it is a bit cleaner by default.