Install Stylish;
Get Fritz pieces from Userstyles;
userstyles.org/styles/112604/lichess-pieces-fritzsws
and then edit it to look like this:
then you will end up with this beauty:
(Firefox 45.0.1.)
Get Fritz pieces from Userstyles;
userstyles.org/styles/112604/lichess-pieces-fritzsws
and then edit it to look like this:
then you will end up with this beauty:
(Firefox 45.0.1.)