Too much information displayed from cookie set by local file vs website

[gearond]

https://bug536650.bmoattachments.org/attachment.cgi?id=419087

Clicking on this link loads the app the first time. Click on the button and it will then display the cookie contents. Firefox is the ONLY browser that doesn't display only 'foo=bar'. See the attached image for what it DOES display.

Description: Ubuntu 20.04.2 LTS
Release: 20.04

firefox:
  Installed: 86.0+build3-0ubuntu0.20.04.1
  Candidate: 86.0+build3-0ubuntu0.20.04.1
  Version table:
 *** 86.0+build3-0ubuntu0.20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
     75.0+build3-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: firefox 86.0+build3-0ubuntu0.20.04.1
ProcVersionSignature: Ubuntu 5.4.0-67.75-generic 5.4.94
Uname: Linux 5.4.0-67-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: gearond 1611 F.... pulseaudio
BuildID: 20210222142601
CasperMD5CheckResult: skip
Channel: Unavailable
CurrentDesktop: MATE
Date: Sat Mar 20 13:46:53 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:348
DefaultProfilePrefSources: /usr/lib/firefox/defaults/pref/all-ubuntumate.js
DefaultProfileThemes: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2020-02-21 (393 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
IpRoute:
 default via 192.168.0.1 dev wlp59s0 proto dhcp metric 600
 169.254.0.0/16 dev wlp59s0 scope link metric 1000
 192.168.0.0/24 dev wlp59s0 proto kernel scope link src 192.168.0.30 metric 600
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:348
Profile0PrefSources:
 /usr/lib/firefox/defaults/pref/all-ubuntumate.js
 prefs.js
Profile0Themes: extensions.sqlite corrupt or missing
Profiles:
 Profile1 (Default) - LastVersion=None/None (Out of date)
 Profile0 - LastVersion=86.0/20210222142601 (In use)
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: Upgraded to focal on 2020-11-27 (112 days ago)
dmi.bios.date: 04/21/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.16.2
dmi.board.name: 02MJVY
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.16.2:bd04/21/2020:svnDellInc.:pnXPS159570:pvr:rvnDellInc.:rn02MJVY:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 15 9570
dmi.product.sku: 087C
dmi.sys.vendor: Dell Inc.

[Olivier Tilloy (osomon)]

That sounds like an upstream issue. Would you mind filing it at https://bugzilla.mozilla.org/enter_bug.cgi#h=dupes%7CFirefox and sharing the link to it here?