What you can do is create a script that sets the variable, then launches
Firefox.

Just run 'sudo gedit /usr/local/bin/firefox'. Then paste the following
into the file and save:

#!/bin/bash
export PULSE_LATENCY_MSEC=20
exec /usr/bin/firefox "$@"

Then run 'sudo chmod a+x /usr/local/bin/firefox'.

This will intercept launches of firefox and set the environment variable
first.

-- 
PulseAudio causes sound latency in 8.10
https://bugs.launchpad.net/bugs/294666
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