If you have Ublock Origin installed, you can add the bypass paywalls clean filterlist and it will work. That is what i did.

Firefox nightly is a pain, you can make a collection on desktop, and add that collection to the app. It's trial and error which extensions work.

The easiest way is to add "https://12ft.io/" before the article's URL and it will bypass the paywall

Kiwi browser with bypass paywall clean extension

I found one solution. At least it works for WSJ. Firefox has a "reading mode" button next to the url. That seems to bypass the paywall

In my experience, 12ft fails to work many times and does not support a wide range of sites. The best way to bypass news paywalls is to use Bypass Paywalls Chrome Clean extension, which is available both for Chrome and for Firefox. It supports many sites, and has recent updates. Browser extensions on Android are much limited, but the best Android browser I found to support extensions is Kiwi browser. Another browser I heard that has supports extensions is Orion browser, though I have not tried it.

Could try searching the url on archive.is or one of its mirrors.

This is what you gotta do yo. Go to the gitlab repo of bypass paywall clean, there the Dev says to install an old version of FF that can install add-on from file then update. link here