Affected Versions:

Nightly 99.a1, Beta 98 and Release 97

Tested on:

MacOS 11
Windows 10

Preconditions:

browser.search.region FR
extensions.formautofill.addresses.enabled - true
extensions.formautofill.addresses.supported to "detect"
extensions.formautofill.addresses.supportedCountries US,CA,FR
download latest Firefox Nightly with region locale
have a complete address already saved in about:preferences#privacy

Steps to reproduce:

1. Reach the address form on decathlon.fr
2. Click in the first field (nom pour cette adresse).
3. Using the autofill feature, select 1 saved address entry from the Prenom field.
4. Using the autofill feature, select 1 saved address entry from the Phone field (last field).

Expected Results:

1. The address autofill dropdown should be displayed for all fields.
2. All the fields should be successfully autofilled.
3. The first row of the address (from about:preferences) should be autofilled in the adresse ligne 1 field and the second row in the adresse ligne 2 field.

Actual Results:

1. The address autofill dropdown is not displayed for the first field (nom pour cette adresse). On Chrome this field is autofilled with the street address.
2. Only the name,country and address line 1 are autofilled by selecting an address from the first 3 fields. Address line 2, postal code, city and phone fields are autofilled only if the user select an address from the respective fields. Somehow the autofill fields are divided into two half.
3. The complete address is autofilled in both address line 1 and address line 2 (see the video attached in comment 1).

Notes:

Reproducible on Chrome: The address line 1, address line 2 , postal code and city fields are not autofilled at all.
Please let me know if separate bugs are needed for the issues above.

Update for Nightly 125.0a1: The autofill is now working for the first field, Name for this address (e.g. Home, Family, Vacation, etc.) but is no longer working for Address (street number and name) field.

Also, the address save doorhanger capture the fields across iframes, the same as it is for autofill. Just let me know I should file a separate bug for the capture doorhanger that is displayed twice containing separate information.

The address is being recognized as a credit card number field, possibly due to the label including the word 'Numéro' .

The patch in bug 1882842 also fixes this bug.

Verified as fixed using Firefox Nightly 140.0a1 (2025-04-28), on Windows 11. The autofill is now working correctly on the Address form for all the fields.
Also, the Save Address doorhanger is displayed only once.