Found in

• Firefox Nightly 125.0a1

Affected versions

• Firefox Nightly 125.0a1

Tested platforms

• Affected platforms: macOS 11.6

Preconditions

• Install DE Firefox build
• Use DE VPN
• browser.search.region = DE
• extensions.formautofill.addresses.experiments.enabled - true
• extensions.formautofill.addresses.supportedCountries = DE
• extensions.formautofill.addresses.capture.requiredFields = empty

Steps to reproduce

1. Reach the address form on https://www.bauhaus.info
2. Click on "Name" field
3. Select any of the options for the dropdown
4. Right click on any of the fields and choose "Clear autofill form"
5. Repeat steps from above for the rest of the fields

Expected result

• Form autofill/preview/clear should be applied on eligible fields.

Actual result

• Form autofill/preview/clear are only applied on the selected field.

Regression range

• N/A

Additional notes

• Not reproducible on Chrome.

The fields on this site are being detected incorrectly. There is a 'company tax number' just before the name that is being detected as a credit card number and then pulling in the name fields as part of a credit card. Deleting this field makes the name and street fill in correctly, but the remaining fields do not get filled in.

The email field seems to autofill correctly, but the autocomplete dropdown seems to be as if it is a password field.

I investigated this further:

• the company tax number is being treated as a credit card number, causing the field matching algorithm to think that there are credit card related fields and modify the name fields to be credit card fields.

• the form has separate street and house number fields. The street matches correctly, but the house number doesn't match any fields. This causes _parseStreetAddressFields to modify the next field (Adresszusatz) to be an address-line1 rather than an address-line2. This causes a section split so the autofill doesn't work for the remaining fields

• Bug 1882842 should fix the first issue.

• For the second issue, _parseStreetAddressFields should be modified to handle this case.

https://hg.mozilla.org/mozilla-central/rev/7e91e12c06e4

Verified as Fixed on MacOS 14, Windows 11 and Ubuntu 22.04.