Clicking an <input type="password"> field in a webextension popup will cause popup to close

[Brendan]

This bug is Ubuntu specific, I've tested in Fedora 28 with Firefox 63.0 and cannot reproduce. I've attached an example extension that triggers the bug.

To reproduce:

1. Go to about:debugging and load test extension
2. Open extension popup and click on text field
3. Try to input text

Expected behavior:

My input shows up in text field

Actual behavior:

Extension popup closes

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: firefox 63.0+build2-0ubuntu0.18.04.2
ProcVersionSignature: Ubuntu 4.15.0-39.42-generic 4.15.18
Uname: Linux 4.15.0-39-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: mymindstorm 1349 F.... pulseaudio
BuildID: 20181023214826
Channel: Unavailable
CurrentDesktop: ubuntu:GNOME
Date: Thu Nov 15 18:51:36 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 2018-11-15 (0 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
IpRoute:
 default via 192.168.122.1 dev ens3 proto dhcp metric 100
 169.254.0.0/16 dev ens3 scope link metric 1000
 192.168.122.0/24 dev ens3 proto kernel scope link src 192.168.122.13 metric 100
IwConfig:
 lo no wireless extensions.

 ens3 no wireless extensions.
Locales: extensions.sqlite corrupt or missing
PrefSources: prefs.js
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Profiles: Profile0 (Default) - LastVersion=63.0/20181023214826 (In use)
RfKill:

RunningIncompatibleAddons: False
SourcePackage: firefox
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: ?-20180531_142017-buildhw-08.phx2.fedoraproject.org-1.fc28
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-2.11
dmi.modalias: dmi:bvnSeaBIOS:bvr?-20180531_142017-buildhw-08.phx2.fedoraproject.org-1.fc28:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-2.11:cvnQEMU:ct1:cvrpc-i440fx-2.11:
dmi.product.name: Standard PC (i440FX + PIIX, 1996)
dmi.product.version: pc-i440fx-2.11
dmi.sys.vendor: QEMU

[Olivier Tilloy (osomon)]

Unsetting the GTK_IM_MODULE environment variable makes the problem go away.

Possibly related: bug #1765304.

[Olivier Tilloy (osomon)]

From duplicate bug #1783514 : the login popup on https://sunrise.ch/ ("My Sunrise") has the same problem, and unsetting the GTK_IM_MODULE environment variable makes it go away.