i installed also the gnome theme... the ugly scroll bar appeared but not in every place where it should be and sometimes it disappeared completely. something is utterly wrong with it. and it seems to be within the adwaita theme, because I dont have this problem under 14.04 only in xenial.
my workaround was downgrading to firefox 45 (gtk2) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1575896 Title: Scrollbar thumb not drawn in firefox 46 (gtk3?) Status in firefox package in Ubuntu: Confirmed 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 AudioDevicesInUse: USER PID ACCESS COMMAND /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 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) InstallationDate: Installed on 2015-08-21 (250 days ago) InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20150819) IpRoute: default via 172.16.1.1 dev wlp3s0 proto static metric 600 169.254.0.0/16 dev docker0 scope link metric 1000 linkdown 172.16.1.0/24 dev wlp3s0 proto kernel scope link src 172.16.1.43 metric 600 172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown Locales: extensions.sqlite corrupt or missing PrefSources: prefs.js [Profile]/extensions/cookie...@jayapal.com/defaults/preferences/cookiemgr.js [Profile]/extensions/keefox@chris.tomlinson/defaults/preferences/prefs.js [Profile]/extensions/{ea4637dc-e014-4c17-9c2c-879322d23268}/defaults/preferences/defaults.js ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash Profiles: Profile0 (Default) - LastVersion=46.0/20160425114621 (In use) RelatedPackageVersions: google-talkplugin 5.41.0.0-1 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) dmi.bios.date: 06/05/2015 dmi.bios.vendor: Apple Inc. dmi.bios.version: MBP114.88Z.0172.B04.1506051511 dmi.board.name: 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.modalias: dmi:bvnAppleInc.:bvrMBP114.88Z.0172.B04.1506051511:bd06/05/2015:svnAppleInc.:pnMacBookPro11,4:pvr1.0:rvnAppleInc.:rnMac-06F11FD93F0323C5:rvrMacBookPro11,4:cvnAppleInc.:ct9:cvrMac-06F11FD93F0323C5: dmi.product.name: MacBookPro11,4 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1575896/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
