Firefox application menu problem with wayland

[Removed by request]

Hi
a few weeks ago, firefox stopped to display its menus. Dropdowns of add-ons stopped working, also.
The system usually runs Gnome

I tried to
- use default GTK theme
- use standard theme in Firefox
- restart in safe-mode
- disable hardware acceleration
- use Ubuntu desktop instead of Gnome
with no success.

Then i've changed my desktop to "Ubuntu with Xorg" at login and the problem vanished. What's the matter?

Kind regards, dsto

Additional information
Version: 93.0+build1-0ubuntu3
Description: Ubuntu 21.10
Release: 21.10

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: firefox 93.0+build1-0ubuntu3
Uname: Linux 5.13.12-051312-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.11-0ubuntu70
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: dani 33215 F.... pulseaudio
 /dev/snd/controlC1: dani 33215 F.... pulseaudio
 /dev/snd/controlC0: dani 33215 F.... pulseaudio
BuildID: 20210927210923
CasperMD5CheckResult: unknown
Channel: Unavailable
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 19 15:15:28 2021
Extensions: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
InstallationDate: Installed on 2018-02-05 (1351 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
Locales: extensions.sqlite corrupt or missing
MostRecentCrashID: bp-2342be4a-ba6e-477e-8b18-eeb621171002
PrefErrors: Unexpected character ',' before close parenthesis @ /usr/lib/firefox/omni.ja:greprefs.js:360
PrefSources:
 prefs.js
 user.js
Profiles: Profile0 (Default) - LastVersion=93.0/20210927210923 (In use)
RunningIncompatibleAddons: False
SourcePackage: firefox
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: Upgraded to impish on 2021-07-28 (82 days ago)
dmi.bios.date: 05/10/2018
dmi.bios.release: 2.32
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: J01 v02.32
dmi.board.asset.tag: CZC1365RZ5
dmi.board.name: 1495
dmi.board.vendor: Hewlett-Packard
dmi.chassis.asset.tag: CZC1365RZ5
dmi.chassis.type: 6
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvrJ01v02.32:bd05/10/2018:br2.32:svnHewlett-Packard:pnHPCompaq8200EliteSFFPC:pvr:skuXL510AV:rvnHewlett-Packard:rn1495:rvr:cvnHewlett-Packard:ct6:cvr:
dmi.product.family: 103C_53307F G=D
dmi.product.name: HP Compaq 8200 Elite SFF PC
dmi.product.sku: XL510AV
dmi.sys.vendor: Hewlett-Packard