I'm getting a similar error to what Maxo described a few months back.
Quixe run: QuotaExceededError: Failed to execute 'setItem' on 'Storage': Setting the value of 'content:save:476c756c0003010201397700015d7500015d7500000100000000003c006ffb6dac023dbf496e666f00010000362e3333302e33380039313730383039c1000030:save' exceeded the quota. Failed to execute 'setItem' on 'Storage': Setting the value of 'content:save:476c756c0003010201397700015d7500015d7500000100000000003c006ffb6dac023dbf496e666f00010000362e3333302e33380039313730383039c1000030:save' exceeded the quota. QuotaExceededError
I'm not sure what I'm doing wrong that it's not letting me save. I'm playing the in-browser version, not the download one if that helps any.