I'm not really sure this problem is with bluez, pulseaudio or firefox. The main symptom is that Firefox refuses to send audio to my AD2P compliant bluetooth speakers. I can select the speakers with the gnome-control-center for bluetooth and play the test sounds (even while FF is playing sound through the computer (DELL N7010 laptop) speakers. Even VLC has the same problem so I suspect this is a system problem and not an application problem.
Note - I installed pavucontrol and was able to switch the audio of a playing youtube to the bluetooth speakers.
now for your recommended info
lsb_release says
Ubuntu 17.10
Firefox is Version 59.0.1
dpkg -l | grep -i blue says
ii bluez 5.46-0ubuntu3 amd64 Bluetooth tools and daemons
ii bluez-cups 5.46-0ubuntu3 amd64 Bluetooth printer driver for CUPS
ii bluez-obexd 5.46-0ubuntu3 amd64 bluez obex daemon
ii bluez-tools 0.2.0~20140808-5build1 amd64 Set of tools to manage Bluetooth devices for linux
ii gir1.2-gnomebluetooth-1.0:amd64 3.26.1-1 amd64 Introspection data for GnomeBluetooth
ii gnome-bluetooth 3.26.1-1 amd64 GNOME Bluetooth tools
ii libbluetooth3:amd64 5.46-0ubuntu3 amd64 Library to use the BlueZ Linux Bluetooth stack
ii libgnome-bluetooth13:amd64 3.26.1-1 amd64 GNOME Bluetooth tools - support library
ii pulseaudio-module-bluetooth 1:10.0-2ubuntu3.1 amd64 Bluetooth module for PulseAudio sound server
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: bluez 5.46-0ubuntu3
ProcVersionSignature: Ubuntu 4.13.0-37.42-generic 4.13.13
Uname: Linux 4.13.0-37-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat Mar 24 14:10:02 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2018-03-19 (5 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
InterestingModules: rfcomm bnep btusb bluetooth
MachineType: Dell Inc. Inspiron N7010
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-37-generic root=UUID=94a7c54a-20a6-4bd0-905c-918de9b5ff61 ro quiet splash vt.handoff=7
SourcePackage: bluez
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/31/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A11
dmi.board.name: 08VFX1
dmi.board.vendor: Dell Inc.
dmi.board.version: A11
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A11
dmi.modalias: dmi:bvnDellInc.:bvrA11:bd03/31/2011:svnDellInc.:pnInspironN7010:pvrA11:rvnDellInc.:rn08VFX1:rvrA11:cvnDellInc.:ct8:cvrA11:
dmi.product.name: Inspiron N7010
dmi.product.version: A11
dmi.sys.vendor: Dell Inc.
hciconfig:
hci0: Type: Primary Bus: USB
BD Address: C0:CB:38:C2:18:51 ACL MTU: 1021:8 SCO MTU: 64:1
UP RUNNING INQUIRY
RX bytes:234685 acl:43 sco:0 events:33407 errors:0
TX bytes:56372584 acl:66043 sco:0 commands:212 errors:0
Thank you for reporting this bug to Ubuntu.
Ubuntu 17.10 (artful) reached end-of-life on July 19, 2018.
See this document for currently supported Ubuntu releases:
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We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in and change the bug status to Confirmed.