Firefox doesn't seem to be a MPRIS "provider"
Relevant Firefox bug:
Seems people are currently implementing this.
Some extra info: websites can share this info using the new Media Session API. Some resources:
The following are possible solutions:
Open terminal and run:
sudo apt-get install --reinstall indicator-sound
sudo apt-get install dconf-editor
Now open dconf:
com --> canonical --> indicator--> sound --> visible
If still not working:
Also make sure
the /etc/xdg/autostart/indicator-sound.desktop file should ...
I found the solution for it.
First I removed any traces of pulseaudio and pulseaudio-equalizer by using the below command
sudo apt purge pulseaudio pulseaudio-equalizer
removed following directories using the following command
rm -rf /etc/pulse /usr/share/pulseaudio usr/share/pulseaudio-equalizer
then reboot the system.
Next reinstalled pulseaudio ...
There is a bug that was reported some time ago on Launchpad which mimics the issue being posed here. Here is the Bug Report.
There seems to be what is a viable workaround for this issue in comment number 20 below the initial report.
Other fixes shown to be successful include updating pulseaudio to version 10 or above however there seems to be less ...
I had a similar issue where increasing the volume on my USB headset by one step (tick) would drastically increase the volume. Even worse, lowering the volume below a certain threshold (roughly 20-25%) would mute the sound alltogether.
I worked around this by installing pavucontrol (sudo apt install pavucontrol) and lowering the volume bar for my music ...