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It says it was tested in Firefox 10, which is a little surprising since it doesn't work at all in Firefox 10. The IndexedDB spec changed and Firefox changed to

• antimatter15 15y ago
  I tested it on an infrequently updated installation of firefox nightly, and the about page said Firefox 10. But I didn't know the API changed, I'll look into it. But how so did it change?
  • khuey 15y ago
    Instead of doing var request = mozIndexedDB.open("databasename"); request.onsuccess = function(event) { request = event.target.result.setVersion(N); request.onsuccess = function(event) { // set up your database } } it looks like var request = mozIndexedDB.open("databasename", N); request.onupgradeneeded = function(event) { // set up your database } request.onsuccess = function(event) { // do stuff with your database } Feel free to email me at <my hacker news username>@mozilla.com if you need a more detailed explanation.