After more investigation, it turns out that there are two different

One in FF 46 (this exact bug) was about an invisible scroll bar, which
got fixed in a later version. The other newer bug started in FF 52,
which is currently about a very thin scroll bar that regressed in 52 and
later (see the screenshots in bug #1675496).

I have changed the duplicates accordingly.

** Changed in: firefox (Ubuntu)
       Status: Confirmed => Fix Released

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  Scrollbar thumb not drawn in Firefox 46 and later (gtk3?)

Status in firefox package in Ubuntu:
  Fix Released

Bug description:
  As of today's firefox 46 release, the scrollbar thumb is not being
  drawn, just see a thin grey bar on the right side of the window.
  Probably related to switchover to gtk3.  Gtk theme is the ubuntu-gnome
  default of Adwaita.

  See screenshot attached.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: firefox 46.0+build5-0ubuntu0.16.04.2
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
   /dev/snd/controlC0:  jbarnett   2545 F.... pulseaudio
   /dev/snd/controlC1:  jbarnett   2545 F.... pulseaudio
   /dev/snd/controlC3:  jbarnett   2545 F.... pulseaudio
   /dev/snd/controlC2:  jbarnett   2545 F.... pulseaudio
  BuildID: 20160425114621
  Channel: Unavailable
  CurrentDesktop: GNOME
  Date: Wed Apr 27 12:47:31 2016
  EcryptfsInUse: Yes
  Extensions: extensions.sqlite corrupt or missing
  ForcedLayersAccel: False
   # 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)
  InstallationDate: Installed on 2015-08-21 (250 days ago)
  InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20150819)
   default via dev wlp3s0  proto static  metric 600 dev docker0  scope link  metric 1000 linkdown dev wlp3s0  proto kernel  scope link  src  metric 
600 dev docker0  proto kernel  scope link  src linkdown
  Locales: extensions.sqlite corrupt or missing
   PATH=(custom, no user)
  Profiles: Profile0 (Default) - LastVersion=46.0/20160425114621 (In use)
   browser-plugin-freshplayer-nacl        0.3.4-3
   browser-plugin-freshplayer-pepperflash 0.3.4-3
   adobe-flashplugin                      1:20160407.1-0ubuntu1
   gnome-shell                            3.20.1-0ubuntu1~xenial3
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: Upgraded to xenial on 2016-02-16 (71 days ago) 06/05/2015
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP114.88Z.0172.B04.1506051511 Mac-06F11FD93F0323C5
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro11,4
  dmi.chassis.type: 9
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-06F11FD93F0323C5
dmi:bvnAppleInc.:bvrMBP114.88Z.0172.B04.1506051511:bd06/05/2015:svnAppleInc.:pnMacBookPro11,4:pvr1.0:rvnAppleInc.:rnMac-06F11FD93F0323C5:rvrMacBookPro11,4:cvnAppleInc.:ct9:cvrMac-06F11FD93F0323C5: MacBookPro11,4
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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