Download sound form opened youtube video in firefox

Works on firefox only with brotab extension.

Brotab:

For terminal use:

pip/pip3 install brotab more here: (https://pypi.org/project/brotab/)

bt install

Mozila extension:

https://addons.mozilla.org/en-US/firefox/addon/brotab/

Both needed for making script runnable.

Example:

Save file to ~/Downloads/:

python3 ./index.py

Save file with custom path:

python3 ./index.py -p ~/path/to/custom/dir/

Saving sound in mp4 format.