[Bug 2011758] [NEW] [REGRESSION] Firefox is ignoring Lubuntu's theme settings entirely

[Launchpad Bug Tracker]

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Steps to reproduce:

1. Boot the latest Lubuntu Lunar ISO.
2. Open KCalc and note the theming on the title bar.
3. Open Firefox.

Expected result: Theming should be consistent between all apps,
including KCalc and Firefox.

Actual result: Firefox's title bar has distinctively GNOME theming,
which looks out of place.

Additional info:

This bug seems to have coincided with
bugs.launchpad.net/ubuntu/+source/openbox/+bug/2011753. Since both bugs
appear Snap-related, this might not be coincidental.

I'm wondering if maybe Firefox is ignoring or is unable to read XDG
settings somehow? That seems like it might cause this.

ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: snapd 2.58.3+23.04ubuntu1
ProcVersionSignature: Ubuntu 6.1.0-16.16-generic 6.1.6
Uname: Linux 6.1.0-16-generic x86_64
ApportVersion: 2.26.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: LXQt
Date: Wed Mar 15 20:48:51 2023
InstallationDate: Installed on 2023-03-16 (0 days ago)
InstallationMedia: Lubuntu 23.04 "Lunar Lobster" - Alpha amd64 (20230314)
SnapChanges: no changes found
SourcePackage: snapd
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: firefox (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug lunar
-- 
[REGRESSION] Firefox is ignoring Lubuntu's theme settings entirely
https://bugs.launchpad.net/bugs/2011758
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