Bypass Paywalls Clean is still around.

Bypass Paywalls Clean for Firefox

Extension: https://gitflic.ru/project/magnolia1234/bypass-paywalls-firefox-clean

Support only: https://github.com/bpc-clone/bpc_firefox_support/issues

Bypass Paywalls Clean for Chrome

Extension: https://gitflic.ru/project/magnolia1234/bypass-paywalls-chrome-clean

Support only: https://github.com/bpc-clone/bpc_chrome_support/issues

Updating

For Firefox at least, if you pin the extension to the browser toolbar (or whatever the space next to the address bar is called) you will see a little yellow triangle badge whenever there is an update. Click the extension icon to update.

For Firefox mobile and forks, you may get a notification that there is an update but I haven't found a one click solution so I just go to the repo, download the xpi and install. To install from file on mobile you need to go to Settings > About Firefox > Tap the logo several times until you see Debug enabled > Go back to main Settings > Under Advanced look for Install extension from file.