1758442 - Page content does not load on orangerie.eu in Private mode

Status: VERIFIED FIXED

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

Description

[Oana Arbuzov [:oanaarbuzov]]

Attachment: PrivateModeVsNormal.png

Environment:
Browser / Version: Firefox Nightly 99.0a1 (🦎 99.0a1-20220307093830), Firefox Focus Release 98.1.1 (🦎 98.0-20220304153049)
Operating System: Google Pixel 5 (Android 12) - 1080 x 2340 pixels, 19.5:9 ratio (~432 ppi density), Samsung Galaxy S8 (Android 9) - 1440 x 2960 pixels, 18.5:9 ratio (~570 ppi density)

Steps to reproduce:

1. Open a "Private window".
2. Type in the address https://orangerie.eu/
3. Observe behavior.

Expected Behavior:
Page content loads.

Actual Behavior:
Page content does not load.

Notes:

1. Screenshot attached.
2. The issue is not reproducible in Firefox Nightly "Normal window" mode.
3. The issue is reproducible in Firefox Nightly "Private window" mode regardless of the ETP status.
4. The issue is not reproducible on Chrome "Incognito" mode.
5. The issue is also reproducible on Firefox Focus regardless of the ETP status.

Comment 1

[Thomas Wisniewski [:twisniewski]]

This also reproduces on desktop. I see this in the web console:

Uncaught FirebaseError: Messaging: This browser doesn't support the API's required to use the firebase SDK. (messaging/unsupported-browser).

And Firebase is trying to use indexedDB, so this is blocked by bug 1639542.

We may want to explore shimming indexedDB on specific sites in private browsing while that bug is being fixed, but in this case they're bundling it with their own scripts, so a general-purpose shim targeting Firebase might not be feasible.

Another option might be to implement no-op versions of indexedDB (and serviceworkers) in PB mode while we implement a better solution, but it's difficult to tell if this would fix more in PB than it breaks.

Comment 2

[Thomas Wisniewski [:twisniewski]]

A work-around which fixes the site breakage just landed in https://phabricator.services.mozilla.com/D149711

I've also confirmed that the page loads on the latest nightly.

Comment 3

[Oana Arbuzov [:oanaarbuzov]]

I can confirm the page loads now in Private mode.
https://prnt.sc/S91ePPKt1aIK

Tested with:
Browser / Version: Firefox Nightly 104.0a1 (🦎 104.0a1-20220711094852)
Operating System: Google Pixel 5 (Android 12) - 1080 x 2340 pixels, 19.5:9 ratio (~432 ppi density), Samsung Galaxy S8 (Android 9) - 1440 x 2960 pixels, 18.5:9 ratio (~570 ppi density)