Is it possible to get mono for the entire system?
You can install PulseEffects-legacy, configure to start with the system and use a plugin called Stereo Tools to get mono effect by “mode” ED > E+D (Sum Mono E+D)
Find the name of output sinks available in Pulseaudio
pactl list short sinks | cut -f2
On my system the response to this is – alsa_output.pci-0000_04_06.0.analog-stereo
The name is used to create a virtual sink to remap the stereo channels to mono
pacmd load-module module-remap-sink master=alsa_output.pci-0000_04_06.0.analog-stereo sink_name=mono sink_properties="device.description='Mono'" channels=2 channel_map=mono,mono
(optional) use this command to set the new mono sink as default for audio playback
pacmd set-default-sink mono
The sound becomes mono but i cane barely hear anything even at 100% volume and its not persistent during reboots. Is there any other way? Is there a way for Firefox only?