This extension is a different one from the 'Bypass Paywalls' one. Earlier, it was available in Firefox add on repos. Now it can be sideloaded. It is available for all major browsers.

Do not kill me, but I was paying for a magazine app, that only yesterday I realized was working flawlessly with this extension despite the site not being a very popular one.

Also, there is a browser based on Firefox, well it's engine Atleast, called 'Smart Cookie Web Preview' on Android that allows side loading of extensions. This allows you to use this extension on Android as well and basically bypass multiple Paywalls on the go.