I added a favicon to the backend in Setttings/Site and replaced the favicon.ico in frontend/public but I still get the plone favicon on both firefox and chrome. Any idea what I'm missing?
You have to also do the public/icon.svg
Thanks @tiberiuichim, that works.
Just a heads up on SVG, I struggled to successfully convert my png and ico files to svg using ubuntu and online tools until I found PNG to SVG (Free, Full Color) - SvgTrace which keeps the original colours intact.