Public bug reported:

Description:    Ubuntu 14.04.4 LTS
Release:        14.04

firefox:
  Installed: 45.0+build2-0ubuntu0.14.04.1
  Candidate: 45.0+build2-0ubuntu0.14.04.1
  Version table:
 *** 45.0+build2-0ubuntu0.14.04.1 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 
Packages
        500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 
Packages
        100 /var/lib/dpkg/status
     28.0+build2-0ubuntu2 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages


When running about:memory there is an initial warning: 

WARNING: the following values are negative or unreasonably large.

    explicit/(18 tiny)
    explicit/(18 tiny)/gfx
    explicit/(18 tiny)/gfx/heap-textures 

This indicates a defect in one or more memory reporters. The invalid
values are highlighted.

And then the following measurements:

─-81.24 MB (-7.12%) -- (18 tiny) [?!]
     ├────9.60 MB (00.84%) ++ storage
     ├────8.93 MB (00.78%) ++ workers/workers(chrome)
     ├────8.08 MB (00.71%) ++ images
     ├────5.91 MB (00.52%) ++ cycle-collector
     ├────4.12 MB (00.36%) ── spell-check
     ├────3.67 MB (00.32%) ++ startup-cache
     ├────2.47 MB (00.22%) ++ network
     ├────1.70 MB (00.15%) ++ dom
     ├────1.05 MB (00.09%) ── xpti-working-set
     ├────0.59 MB (00.05%) ── preferences
     ├────0.52 MB (00.05%) ++ xpcom
     ├────0.43 MB (00.04%) ── icu
     ├────0.41 MB (00.04%) ── cookie-service
     ├────0.38 MB (00.03%) ── telemetry
     ├────0.15 MB (00.01%) ── history-links-hashtable
     ├────0.13 MB (00.01%) ── script-namespace-manager
     ├────0.10 MB (00.01%) ++ media
     └──-129.48 MB (-11.35%) -- gfx [?!]
        ├─────0.62 MB (00.05%) ── font-shaped-words
        ├─────0.42 MB (00.04%) ── font-tables
        ├─────0.10 MB (00.01%) ── font-list
        ├─────0.04 MB (00.00%) ── font-cache
        ├─────0.03 MB (00.00%) ── font-charmaps
        └──-130.70 MB (-11.46%) ── heap-textures [?!]

These should obviously not be negative.  Even after running a GC, a CC
or a minimize memory usage and closing all tabs the measurements remain
and actually grow at times.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: firefox 45.0+build2-0ubuntu0.14.04.1
ProcVersionSignature: Ubuntu 3.13.0-83.127-generic 3.13.11-ckt35
Uname: Linux 3.13.0-83-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  ryan       3190 F.... pulseaudio
 /dev/snd/controlC1:  ryan       3190 F.... pulseaudio
BuildID: 20160304114926
Channel: Unavailable
CurrentDesktop: Unity
Date: Wed Mar 30 10:57:44 2016
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2014-11-22 (493 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
IpRoute:
 default via 192.168.11.1 dev wlan0  proto static 
 192.168.11.0/24 dev wlan0  proto kernel  scope link  src 192.168.11.104  
metric 9 
 192.168.122.0/24 dev virbr0  proto kernel  scope link  src 192.168.122.1
MostRecentCrashID: bp-9660fa97-f7a4-48af-bbff-b631e2150402
PrefSources:
 prefs.js
 [Profile]/extensions/[email protected]/defaults/preferences/defaults.js
 
[Profile]/extensions/[email protected]/defaults/preferences/preferences.js
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/zsh
Profiles: Profile0 (Default) - LastVersion=45.0/20160304114926 (In use)
RelatedPackageVersions:
 totem-mozilla     3.10.1-1ubuntu4
 rhythmbox-mozilla 3.0.2-0ubuntu2
 google-talkplugin 5.41.0.0-1
RunningIncompatibleAddons: True
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/01/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: GMET66WW (2.14 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20BE003NUS
dmi.board.vendor: LENOVO
dmi.board.version: 0B98401 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: 
dmi:bvnLENOVO:bvrGMET66WW(2.14):bd07/01/2014:svnLENOVO:pn20BE003NUS:pvrThinkPadT540p:rvnLENOVO:rn20BE003NUS:rvr0B98401WIN:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 20BE003NUS
dmi.product.version: ThinkPad T540p
dmi.sys.vendor: LENOVO

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug third-party-packages trusty

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https://bugs.launchpad.net/bugs/1563959

Title:
  Negative values in memory measurement

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