Public bug reported:

Hello,

after installing the current live image of Kubuntu Jammy, I tested the
preinstalled Firefox snap on the Plasma Wayland session (which I use by
default), and discovered multiple UI and theming issues:

1. I had switched my global theme to Breeze Dark. Nevertheless Firefox
used a light theme when I launched it for the first time. Interestingly,
at further runs Firefox properly came up with a dark theme. But I had
restarted my session in between and also had removed and reinstalled the
Firefox snap, so it's possible that one of these actions triggered
Firefox to finally use a dark theme.

2. The font size in the UI is too big (compare with other KDE apps on
screenshots).

3. It apparently doesn't use Breeze (light or dark) as the UI theme, but
something else (Adwaita I guess).

4. The mouse cursor uses the wrong theme and is too big (it changes
visible if move the cursor in and out of the Firefox window).

5. If I click e.g. on "File -> Open file...", the file dialog is not the
one from KDE but the one from GTK/Gnome. And the UI text is displayed in
a rather jagged/distorted way (see screenshot).

The issues described above do _not_ appear:
* If I run Firefox as snap in Plasma X11 session.
* If I run Firefox as deb (both Plasma Wayland and X11 session work fine).

Kind regards, Jan

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: firefox 96.0.2+build1-0ubuntu1
ProcVersionSignature: Ubuntu 5.15.0-17.17-generic 5.15.12
Uname: Linux 5.15.0-17-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.11-0ubuntu75
Architecture: amd64
BuildID: 20220119190439
CasperMD5CheckResult: pass
Channel: Unavailable
CurrentDesktop: KDE
Date: Tue Jan 25 17:19:38 2022
DefaultProfileExtensions: extensions.sqlite corrupt or missing
DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
DefaultProfileLocales: extensions.sqlite corrupt or missing
DefaultProfilePrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:365
DefaultProfileThemes: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
InstallationDate: Installed on 2022-01-25 (0 days ago)
InstallationMedia: Kubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 
(20220125.1)
IpRoute:
 default via 192.168.178.1 dev enp4s0 proto dhcp metric 100 
 169.254.0.0/16 dev enp4s0 scope link metric 1000 
 192.168.178.0/24 dev enp4s0 proto kernel scope link src 192.168.178.44 metric 
100
Profile0Extensions: extensions.sqlite corrupt or missing
Profile0IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
Profile0Locales: extensions.sqlite corrupt or missing
Profile0PrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:365
Profile0PrefSources: prefs.js
Profile0Themes: extensions.sqlite corrupt or missing
Profiles:
 Profile1 (Default) - LastVersion=None/None (Out of date)
 Profile0 - LastVersion=96.0.2/20220119190439
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/18/2009
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F14
dmi.board.name: P35-DS3
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF14:bd06/18/2009:svnGigabyteTechnologyCo.,Ltd.:pnP35-DS3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnP35-DS3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:sku:
dmi.product.name: P35-DS3
dmi.sys.vendor: Gigabyte Technology Co., Ltd.

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug jammy wayland-session

** Attachment added: "Wrong theme, UI font too big"
   
https://bugs.launchpad.net/bugs/1959027/+attachment/5557383/+files/Screenshot_20220125_165617.png

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https://bugs.launchpad.net/bugs/1959027

Title:
  Various UI and theming issues in Firefox snap when running in Plasma
  Wayland session

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