1427848 - Password manager does not sync username when selecting a password

Status: RESOLVED WONTFIX

(Toolkit :: Password Manager, defect)

Description

[booc0mtaco]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/604.4.7 (KHTML, like Gecko) Version/11.0.2 Safari/604.4.7

Steps to reproduce:

Setup
1. Navigate to https://jsfiddle.net/oo8bsq7b/
2. Enter any username / password and press submit
3. "save" this login
4. repeat 1-2 times to save a few username/password combinations

Bug:
1. Select a username from the password manager (e.g. test1)
2. Clear the password that gets repopulated for that account
3. click in the password field, triggering the password manager , and select a different username/password combination (e.g., test2)



Actual results:

Observe that the password field is populated with test2's password, but the username field retains the original value (e.g. test1).


Expected results:

If you select a username/password combination from the password manager, it should always keep those two fields in sync. In this case, if you empty the password field and select a different saved account, it should update BOTH the username and password fields. There's no clear use case for using one saved account's password with a different username.

(I've opened a similar issue for chromium here: https://bugs.chromium.org/p/chromium/issues/detail?id=796988)

Comment 1

[booc0mtaco]

Attachment: ff57.gif

GIF demonstrating username/password field behavior

Comment 2

[Matthew N. [:MattN]]

This is intentional behaviour since detecting the username field often relies on heuristics and we don't want to overwrite an unrelated field with the username for the second fill.