Public bug reported:

STR:
1. Open Firefox 49 with clean profile
2. Go to any site

What happens: The site loads but the content is rendered blank. The page
is loaded properly since I can hover over (invisible) links and see the
cursor change & the address to be shown in the bottom of the window.

What should happen: The site is rendered properly.

This is related to e10s and how the Ubuntu builds are configured / built:
* If e10s is disabled, everything works fine.
* If I download Firefox 49 release build built by Mozilla, pages are rendered 
correctly with both e10s and non-e10s windows.

If I execute firefox from the command line, I see the following output repeated 
constantly:
[GFX1]: Failed 2 buffer db=0 dw=0 for 1356, 0, 64, 673
[GFX1]: Failed 2 buffer db=0 dw=0 for 0, 0, 64, 500
... continues forever with different coordinates

See the attached screenshot for how the first-run page looks like with a
clean profile.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: firefox 49.0+build4-0ubuntu0.16.04.1
ProcVersionSignature: Ubuntu 4.4.0-38.57-generic 4.4.19
Uname: Linux 4.4.0-38-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  sami       2154 F.... pulseaudio
BuildID: 20160920074044
Channel: Unavailable
CurrentDesktop: Unity
Date: Sat Sep 24 07:38:09 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: Shockwave Flash - 
/usr/lib/adobe-flashplugin/libflashplayer.so (adobe-flashplugin)
DefaultProfilePrefSources: prefs.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
IpRoute:
 default via 192.168.0.1 dev wlan0  proto static  metric 600 
 169.254.0.0/16 dev wlan0  scope link  metric 1000 
 192.168.0.0/24 dev wlan0  proto kernel  scope link  src 192.168.0.11  metric 
600
MostRecentCrashID: bp-f39a0daf-a559-4d71-813b-3403e2151223
Profile1Extensions: extensions.sqlite corrupt or missing
Profile1IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
Profile1Locales: extensions.sqlite corrupt or missing
Profile1PrefSources: prefs.js
Profile1Themes: extensions.sqlite corrupt or missing
Profile2Extensions: extensions.sqlite corrupt or missing
Profile2IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
Profile2Locales: extensions.sqlite corrupt or missing
Profile2Plugins: Shockwave Flash - /usr/lib/adobe-flashplugin/libflashplayer.so 
(adobe-flashplugin)
Profile2PrefSources: prefs.js
Profile2Themes: extensions.sqlite corrupt or missing
Profiles:
 Profile0 (Default) - LastVersion=49.0/20160920074044 (In use)
 Profile1 - LastVersion=48.0/20160728203720 (Out of date)
 Profile2 - LastVersion=44.0a1/20151027030239 (Out of date)
RunningIncompatibleAddons: False
SourcePackage: firefox
SubmittedCrashIDs:
 bp-f39a0daf-a559-4d71-813b-3403e2151223
 bp-fb9e28fa-1e38-4c9b-9b18-beeea2151222
 bp-0d0ac494-189a-42b2-addf-852f62151119
 bp-6033c3ae-3d54-425f-8e39-f7ad72151113
 bp-12fc418e-bdf6-42c1-a648-e102d2151107
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/19/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: K56CM.209
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: K56CM
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrK56CM.209:bd11/19/2012:svnASUSTeKCOMPUTERINC.:pnK56CM:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnK56CM:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.name: K56CM
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

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


** Tags: amd64 apport-bug xenial

** Attachment added: "firefox-49-first-run-page.png"
   
https://bugs.launchpad.net/bugs/1627239/+attachment/4747564/+files/firefox-49-first-run-page.png

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https://bugs.launchpad.net/bugs/1627239

Title:
  Web pages not rendering with e10s enabled

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