In my case (Ubuntu- not windows), I had the cache at my home directory under .~/.icedtea/cache. Had to erase it kill firefox and also manualy erase cache under de .mozilla directory also at home dir. After restarting Firefox, everything loaded fine
I like something more like setting a tag at the full map to remember someting (like 100carat mine) . Also +1 to bigger map icon and maybe map interaction like in the small round map.