(generic?) problem with clickable menues. Here: Firefox

[udippel]

After the most recent updates, in the previous around 2 weeks, subsequently mouse interaction of menues fail.
In this case, Firefox does not longer allow access of its menu with mouse clicks.

Firefox is not the only application with this problem, and I am not the only person experiencing this trouble, see 1781163.
Even in firefox this behavoiur is highly selective: the general menu is inaccessible, while the bookmark menu opens.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: firefox 61.0.1+build1-0ubuntu0.16.04.1
ProcVersionSignature: Ubuntu 4.4.0-130.156-generic 4.4.134
Uname: Linux 4.4.0-130-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: udippel 3133 F.... pulseaudio
 /dev/snd/controlC0: udippel 3133 F.... pulseaudio
BuildID: 20180704194937
Channel: Unavailable
CurrentDesktop: KDE
Date: Tue Jul 17 10:39:37 2018
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 2015-04-01 (1202 days ago)
InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.1)
IpRoute:
 default via 134.91.100.126 dev eth0 proto static metric 100
 134.91.100.0/25 dev eth0 proto kernel scope link src 134.91.100.61 metric 100
 169.254.0.0/16 dev eth0 scope link metric 1000
Locales: extensions.sqlite corrupt or missing
Plugins: Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
PrefErrors: Unexpected character ',' whilst parsing int @ /usr/lib/firefox/defaults/pref/vendor-gre.js:8
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=61.0.1/20180704194937 (In use)
RunningIncompatibleAddons: False
SourcePackage: firefox
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: Upgraded to xenial on 2016-12-07 (586 days ago)
dmi.bios.date: 10/11/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 6UET70WW (1.50 )
dmi.board.name: 2924WEG
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr6UET70WW(1.50):bd10/11/2012:svnLENOVO:pn2924WEG:pvrThinkPadT410s:rvnLENOVO:rn2924WEG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2924WEG
dmi.product.version: ThinkPad T410s
dmi.sys.vendor: LENOVO

[Paul White (paulw2u)]

Probably a duplicate of bug 1782052 already reported.
Not marking as being a duplicate as the correct package needs to be ascertained first.
Seems to be a KDE problem.

[Paul White (paulw2u)]

is this still an issue now that Firefox 65.0.1 is the currently supported release? I'm not seeing this problem running Kubuntu 19.04 (dev) in a VM.