My new favorite Firefox extension: Art Up Your Tab, with free culture from Europeana: https://addons.mozilla.org/firefox/addon/artupyourtab/

https://octodon.social/media/WbDT7Nm1f-Glci5DeIQ https://octodon.social/media/LVvycbX4jKwhQ--dTME https://octodon.social/media/oCcjGpujgj81-JxpgQw