Thanks for pointing this out--it brought my attention to the author's Irmin backend, based on the browser's implementation of IndexedDB: https://github.com/tal

Thanks for pointing this out--it brought my attention to the author's Irmin backend, based on the browser's implementation of IndexedDB: https://github.com/talex5/irmin-indexeddb https://github.com/talex5/irmin-indexeddb That said, trying out this demo [1] of Cuekeeper gives an IndexedDB error message on Firefox 40.0.3 on Linux; perhaps IndexedDB is somehow not enabled. [1] http://roscidus.com/blog/cuekeeper/ http://roscidus.com/blog/cuekeeper/