Public bug reported:

Edit -> Preferences -> Content
Click "Advanced" from "Font & colors section"

Firefox hangs with, then message :
A script on this page may be busy, or it may have stopped responding. You can 
stop the script now, open the script in the debugger, or let the script 
continue.
Script: chrome://mozapps/content/preferences/fontbuilder.js:23

Click continue and Fx remains unresponsive then loops back to the same
message.

Happens with Fx 49.0.2 and Nightly 53.0a1 (2016-11-15) (64-bit) with clean 
profile.
Ubuntu 16.04 amd64.

In the same time, a similar issue appeared in thunderbird beta and
earlybird : It stops responding for a long time when using preference
dialog and compose window is broken.

I went there to figure out why default font on some sites looks like this :
https://framapic.org/h0P9CQ1u3FCi/WQDhRYVhfA0e.png
This is recent too.

Why everything is going wrong with all mozilla softwares at the same
time and is affecting most (all?) versions ?

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: firefox 49.0.2+build2-0ubuntu0.16.04.2
Uname: Linux 4.6.4-040604-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  fabien    22381 F.... pulseaudio
BuildID: 20161025170400
Channel: Unavailable
CurrentDesktop: Unity
Date: Wed Nov 16 10:17:13 2016
DefaultProfileExtensions: extensions.sqlite corrupt or missing
DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
DefaultProfileLocales: extensions.sqlite corrupt or missing
DefaultProfilePlugins:
 IcedTea-Web Plugin (using IcedTea-Web 1.6.2 (1.6.2-3ubuntu1)) - 
/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so 
(icedtea-8-plugin)
 Shockwave Flash - 
/usr/lib/browser-plugin-freshplayer-pepperflash/libfreshwrapper-flashplayer.so 
(browser-plugin-freshplayer-pepperflash)
DefaultProfilePrefSources:
 prefs.js
 
[Profile]/extensions/{45d8ff86-d909-11db-9705-005056c00008}/defaults/preferences/defaults.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 2016-04-23 (206 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
IpRoute:
 default via 192.168.0.1 dev eno1  proto static  metric 100 
 169.254.0.0/16 dev eno1  scope link  metric 1000 
 192.168.0.0/24 dev eno1  proto kernel  scope link  src 192.168.0.2  metric 100
IwConfig:
 lo        no wireless extensions.
 
 eno1      no wireless extensions.
MostRecentCrashID: bp-1d01ee2d-7d26-46c7-8dde-764092161116
ProcEnviron:
 LANGUAGE=fr_FR
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.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
Profile0Plugins:
 IcedTea-Web Plugin (using IcedTea-Web 1.6.2 (1.6.2-3ubuntu1)) - 
/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so 
(icedtea-8-plugin)
 Shockwave Flash - 
/usr/lib/browser-plugin-freshplayer-pepperflash/libfreshwrapper-flashplayer.so 
(browser-plugin-freshplayer-pepperflash)
 Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
Profile0PrefSources:
 prefs.js
 
[Profile]/extensions/{45d8ff86-d909-11db-9705-005056c00008}/defaults/preferences/defaults.js
Profile0Themes: extensions.sqlite corrupt or missing
Profile1Extensions: extensions.sqlite corrupt or missing
Profile1IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
Profile1Locales: extensions.sqlite corrupt or missing
Profile1Plugins: Shockwave Flash - 
/usr/lib/browser-plugin-freshplayer-pepperflash/libfreshwrapper-flashplayer.so 
(browser-plugin-freshplayer-pepperflash)
Profile1PrefSources: prefs.js
Profile1Themes: extensions.sqlite corrupt or missing
Profiles:
 Profile0 - LastVersion=51.0a1/20160917030427 (Out of date)
 Profile1 - LastVersion=53.0a1/20161115030213 (Out of date)
 Profile2 (Default) - LastVersion=49.0.2/20161025170400 (In use)
RelatedPackageVersions:
 icedtea-8-plugin                       1.6.2-3ubuntu1
 browser-plugin-freshplayer-pepperflash 0.3.6-1~webupd8~xenial6
RfKill:
 
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/04/2012
dmi.bios.vendor: Intel Corp.
dmi.bios.version: BLH6710H.86A.0160.2012.1204.1156
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: DH67BL
dmi.board.vendor: Intel Corporation
dmi.board.version: AAG10189-209
dmi.chassis.type: 3
dmi.modalias: 
dmi:bvnIntelCorp.:bvrBLH6710H.86A.0160.2012.1204.1156:bd12/04/2012:svn:pn:pvr:rvnIntelCorporation:rnDH67BL:rvrAAG10189-209:cvn:ct3:cvr:

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


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

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https://bugs.launchpad.net/bugs/1642198

Title:
  preference freeze

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