1873191 - Account previously used not shown when switching accounts/logging out on office.com with Standard ETP

Status: NEW

(Core :: Privacy: Anti-Tracking, defect, P3)

Description

[Calin Tanase]

Attachment: office account switch and log out.mp4

Environment:
Operating system: OnePlus 6 A6000 (Android 11)
Firefox version: Nightly 123.0a1-20240104091910

Preconditions:
• Account needed
• ETP set to STANDARD
• Clean profile

Steps to reproduce:

1. Go to https://www.office.com
2. Log into your account.
3. Tap on the account icon.
4. Tap on the "Sign in with a different account".
5. Check if the account previously used appears below the "Sign-in options" button.

Expected Behaviour:
Account previously used appears below the "Sign-in options" button.

Actual Behaviour:
Account previously used is missing below the "Sign-in options" button.

Notes:

1. Screen rec provided
2. Reproducible on Firefox Release as well
3. Not reproducible with ETP disabled
4. Same behaviour in Private mode
5. Issue found during WebCompat team [Top100] websites testing

Comment 1

[Emma Zühlcke [:emz]]

Attachment: Chrome Desktop office.com account switch

I'm seeing a similar issue on Chrome Desktop (stable), so I'm not sure if this is a Firefox issue. The previously signed in account is listed briefly but then dissappears. Could you please clarify if this is the bug you're describing in Firefox?

Comment 2

[Emma Zühlcke [:emz]]

Attachment: office-switch-account-chrome-stable.m4v

Comment 3

[Emma Zühlcke [:emz]]

Comment on attachment 9372481 [details]
Chrome Desktop office.com account switch

obsolete

Comment 4

[Calin Tanase]

Attachment: Chrome vs FF - account switch/log out.mp4

Works just fine for me on Chrome, the account is shown and does not disappear. The behaviour on Desktop version is the same as on mobile, as shown in my first recording.

Note: Does not reproduce with ETP disabled.

Comment 5

[Emma Zühlcke [:emz]]

Thanks for checking again. I unfortunately still can't reproduce the working state on Desktop in Chrome or Chrome Canary.
I'm curious if this is breakage caused by blocking third-party cookies. Could you please test in Chrome with third-party cookies restricted?

1. In Chrome visit chrome://flags/#test-third-party-cookie-phaseout and switch the dropdown to "Enabled"
2. Restart the browser or press the "Relaunch" button.
3. Test with bug STR

Comment 6

[Calin Tanase]

Attachment: Chrome third party cookie phaseout enabled.mp4

The account is no longer displayed when switching accounts with chrome://flags/#test-third-party-cookie-phaseout/Enabled.

Tested on Windows 10 / Chrome 120.0.6099.225

Comment 7

[Emma Zühlcke [:emz]]

Thanks for confirming! This seems like third-party cookie breakage which will also affect Chrome users soon as they're rolling out. Doesn't seem very problematic as users can still log in.