Can't Move, Resize or Maximize Firefox Anymore

[Lonnie Lee Best]

Since the most recent Firefox update, I've lost the ability to control Firefox's window in Kubuntu 20.04.

Upon launch, it launches in a un-maximized state where I cannot drag it by its title bar. I have to hold down the alt-key an click the window to move it.

Hovering the mouse-cursor on any corner of window doesn't produce any indication that you can resize the Firefox window and "clicking an dragging corners" does nothing (which should resize instead).

The maximize button is completely missing from the title bar of Firefox and the superKey+pageUp doesn't maximize the window either.

I realize that I'm pointing out multiple things in one post, but I suspect all of these things are stemming from the same source problem, because all these problems started happening after the latest Firefox update in Kubuntu 20.04.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: firefox 89.0.2+build1-0ubuntu0.20.04.1
ProcVersionSignature: Ubuntu 5.4.0-77.86-generic 5.4.119
Uname: Linux 5.4.0-77-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
AddonCompatCheckDisabled: False
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: lonnie 1629 F.... pulseaudio
 /dev/snd/controlC0: lonnie 1629 F.... pulseaudio
BuildID: 20210622155641
CasperMD5CheckResult: skip
Channel: Unavailable
CurrentDesktop: KDE
Date: Mon Jul 5 11:28:01 2021
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:355
DefaultProfileThemes: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
InstallationDate: Installed on 2020-04-26 (435 days ago)
InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
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:355
Profile0PrefSources: prefs.js
Profile0Themes: extensions.sqlite corrupt or missing
Profiles:
 Profile1 (Default) - LastVersion=None/None (Out of date)
 Profile0 - LastVersion=89.0.2/20210622155641
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/12/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.05.04RSA5
dmi.board.asset.tag: Tag 12345
dmi.board.name: Bonobo WS
dmi.board.vendor: System76
dmi.board.version: bonw13
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: System76
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.05.04RSA5:bd12/12/2017:svnSystem76:pnBonoboWS:pvrbonw13:rvnSystem76:rnBonoboWS:rvrbonw13:cvnSystem76:ct10:cvrN/A:
dmi.product.family: Not Applicable
dmi.product.name: Bonobo WS
dmi.product.sku: Not Applicable
dmi.product.version: bonw13
dmi.sys.vendor: System76