1890835 - PopupNotifications panel is shown on top of non Firefox windows on Windows 10

Status: RESOLVED INVALID

(Core :: Widget: Win32, defect, P3)

Description

[Emma Zühlcke [:emz]]

It looks like panels shown by PopupNotifications code (commonly used for permission prompts) are rendered on top of other windows, even when the parent Firefox window is not in front.

Tested on Windows 10 Pro x86_64 with Nightly (2024-04-10).

STR:

1. Open Firefox Nightly and navigate to https://permission.site
2. Click on any of the permission buttons, e.g. geolocation and wait for the permission prompt to appear.
3. Open a different application window, e.g. Explorer and drag it over the location of the permission prompt.

Expected:
The Explorer window covers the main Firefox window along with the permission prompt panel (PopupNotification).

Actual:
The panel is shown on top of the Explorer window, even though the Explorer window is in front / has focus.

Does not affect Windows 11, only Windows 10.

Comment 1

[Ray Kraesig [:rkraesig]]

I can't reproduce this on a freshly-updated Nightly. (Also on Win10.)

Can you try reproducing it in mozregression to see if this is a recent change for you, and/or if there's profile-dependent shenanigans going on?

Comment 2

[Emma Zühlcke [:emz]]

Oh, weird. I can't reproduce it anymore today. I've tested it again with a fresh profile. It's possible that this was caused by some prefs I had tested. I'm closing as INVALID, please update if that's not the correct resolution though.