• Install 'Firefox Nightly For Developers' from the playstore
• Create a firefox account (accounts.firefox.com) and signin into it
• Go to https://addons.mozilla.org/en-US/firefox/addon/bypass-paywalls-clean/
  • sigin into the firefox account if necessary
  • Scroll down to “Add to collection”
    • If this is the first time → “Create new collection”, say raju_addons.
    • When you are creating your collection, you will see a number in the Custom URL field. This number is your user ID. This is needed when linking the collection to your User ID.
    • Add the extension to that collection.
• Link the collection to your account
  • Firefox → 3 dots at the bottom right → Settings → About Firefox Nightly → Tap on the logo 5 times
  • Go back to Settings
  • Custom Add-on collection
    • Give the User ID, collection name
  • Application will close
• Restart the app → 3 dots at the bottom right → Add-ons → click on the + sign next to “BypassPaywalls Clean” → Allow in private browsing → Check

tested on | Google pixel 6

Ref:

• https://gitlab.com/magnolia1234/bypass-paywalls-chrome-clean
• https://addons.mozilla.org/en-US/firefox/addon/bypass-paywalls-clean/
• https://news.ycombinator.com/item?id=31647995
• https://support.mozilla.org/en-US/kb/extended-add-support