Fails ACID3 test

[Uqbar]

It fails the acid3.acidtests.org.
The reported failure is:

Test 35 failed: expected '0' but got '1' - root element, with no parent node, claims to be a :first-child

See attached screenshot.
The same failure is happening also to Google Chrome 58.0.3029.81.
Previous versions used to succeed.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: firefox 53.0+build6-0ubuntu0.16.04.1
Uname: Linux 4.10.11-041011-lowlatency x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: enzo 3368 F.... pulseaudio
BuildID: 20170418123315
Channel: Unavailable
CurrentDesktop: KDE
Date: Fri Apr 21 09:10:58 2017
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)
IpRoute:
 default via 192.168.254.254 dev enp2s0 proto static metric 100
 169.254.0.0/16 dev enp2s0 scope link metric 1000
 192.168.254.0/24 dev enp2s0 proto kernel scope link src 192.168.254.42 metric 100
IwConfig:
 lo no wireless extensions.

 enp2s0 no wireless extensions.
Locales: extensions.sqlite corrupt or missing
Plugins: Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=53.0/20170418123315 (In use)
RfKill:
 0: hci0: Bluetooth
  Soft blocked: no
  Hard blocked: no
RunningIncompatibleAddons: False
SourcePackage: firefox
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/22/2013
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: L02 v02.01
dmi.board.asset.tag: CZC3523T17
dmi.board.name: 18EB
dmi.board.vendor: Hewlett-Packard
dmi.chassis.asset.tag: CZC3523T17
dmi.chassis.type: 6
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvrL02v02.01:bd09/22/2013:svnHewlett-Packard:pnHPProDesk490G1MT:pvr:rvnHewlett-Packard:rn18EB:rvr:cvnHewlett-Packard:ct6:cvr:
dmi.product.name: HP ProDesk 490 G1 MT
dmi.sys.vendor: Hewlett-Packard

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.