Form autofill for addresses is limited to certain countries, you can force-enable it by visiting about:config and changing extensions.formautofill.addresses.supportedCountries to include your two-letter country code (found under browser.search.region) then restart.

Thank you very much. I wonder why it's limited to certain countries? Anyhow it works now, Thanks again.

I'm from Germany and the credit card function used to work in the previous versions of Firefox. But with version 117 it disappeared for me. After following the solution provided I noticed that the "extensions.formautofill.addresses.supportedCountries" was only filled in with the US and CA. So instead of enabling this option for me in version 117 the update took it away and I had to manually enter DE in about:config.

It still wasn't working, but I found out, that my browser.search.region was set to DK instead of DE, no idea why.

The home region could change to Denmark if you traveled there or used a VPN located there for some time.

What have you done now?

All my autofill is gone!

Thank God I have an older laptop that still has them stored.

Worse yet I tried the fix it you recommended and NO IT DID NOT WORK! I hope you install all future "updates" on your own PC's so you get screwed over by your mistakes as well.