I asked this because on another forum someone else asked. But I cannot for the life of me remember which that was now.
@rory Just searching for "OpenStreetMap" in either the Chrome or Firefox extensions catalog finds quite a few. Maybe OpenSwitchMaps is the one you were thinking?
@rory Privacy Redirect.
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!