1801277 - Virtual assistant window stuck in a loading loop on microsoft.com with ETP set to Standard

Status: RESOLVED FIXED

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

Description

[Calin Tanase]

Attachment: chat microsoft.mp4

Environment:
Operating system: OnePlus 6 A6000 (Android 11)
Firefox version: Nightly 109.0a1-20221117093901

Preconditions:
• ETP set to Standard
• Clean profile

Steps to reproduce:

1. Go to https://www.microsoft.com/en-us/store/configure/Surface-Pro-9/93VKD8NP4FVK
2. Tap on the "Questions? Talk to an expert" button.
3. Observe the behaviour

Expected Behaviour:
Virtual assistant window loads.

Actual Behaviour:
Virtual assistant window is stuck in a loading loop.

Notes:

1. Video provided
2. Reproducible with both Standard and Strict ETP
3. Not reproducible with ETP off
4. Same behaviour in Private

Comment 1

[Tim Huang[:timhuang]]

It's because we partition cookies for liveperson.net under microsoft.com. I think we can resolve this issue by introducing a shim that calls storage access API for liveperson.net when clicking the Questions? Talk to an expert button. Note that the button is not in a liveperson.net iframe but in microsoft.com.

Comment 2

[Tim Huang[:timhuang]]

Attachment: Bug 1801277 - Add a shim for microsoft virtual assistant. r?pbz!,twisniewski!

The patch adds a shim for fixing the microsoft virtual assistant. The
iframe of the virtual assistant will fail when accessing the indexedDB
because the domain of the virutal assistant is categoried as a tracker.
Accessing the indexedDB in this case will throw a security error which
leads to the site breakage.

The shim replaces the indexedDB with a fake interface that won't throw
an error when accessing it to fix the problem.

Comment 3

[Tim Huang[:timhuang]]

The root cause of the site issue is that the site doesn't handle the security error thrown when accessing the indexedDB in the liveperson.net iframe. The liveperson.net is categorized as a tracker, so accessing the indexedDB in a third-party context will throw an error.

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/7285da60030b
Add a shim for microsoft virtual assistant. r=twisniewski,webcompat-reviewers

Comment 5

[Cristian Tuns]

https://hg.mozilla.org/mozilla-central/rev/7285da60030b