Quota is based on domain, and in your case you're serving up everything from dl.dropbox.com. Maybe these users already have stuff in their localStorage from ot

Quota is based on domain, and in your case you're serving up everything from dl.dropbox.com. Maybe these users already have stuff in their localStorage from other sites that happen to use that domain? Seems like the fix for that would be to serve up the html on your own domain so that other sites, eg dropbox, won't mess with your quotas. Also, that would fix the location permission dialog that says "dl.dropbox.com wants to track your location".