Nightly builds always come ahead of other variants and now it got updated to version 90.0a1. In this version, you may notice a Credit cards section that allows you to manually add credit cards data that can be used later on the web.
This menu also has a toggle to turn on "save and autofill cards" feature. There you can sync your stored cards across devices as well.
How to test:
- Open Firefox settings.
- Select the Credit cards option.
- Tap on the + button.