diff --git a/dom/datastore/DataStore.jsm b/dom/datastore/DataStore.jsm
index 45884bf2f260..c3c665acb479 100644
--- a/dom/datastore/DataStore.jsm
+++ b/dom/datastore/DataStore.jsm
@@ -458,104 +458,6 @@ this.DataStore.prototype = {
     return this._revisionId;
   },
 
-  getChanges: function(aRevisionId) {
-    debug("GetChanges: " + aRevisionId);
-
-    if (aRevisionId === null || aRevisionId === undefined) {
-      return this._window.Promise.reject(
-        new this._window.DOMError("SyntaxError", "Invalid revisionId"));
-    }
-
-    let self = this;
-
-    // Promise<DataStoreChanges>
-    return new this._window.Promise(function(aResolve, aReject) {
-      debug("GetChanges promise started");
-      self._db.revisionTxn(
-        'readonly',
-        function(aTxn, aStore) {
-          debug("GetChanges transaction success");
-
-          let request = self._db.getInternalRevisionId(
-            aRevisionId,
-            aStore,
-            function(aInternalRevisionId) {
-              if (aInternalRevisionId == undefined) {
-                aResolve(undefined);
-                return;
-              }
-
-              // This object is the return value of this promise.
-              // Initially we use maps, and then we convert them in array.
-              let changes = {
-                revisionId: '',
-                addedIds: {},
-                updatedIds: {},
-                removedIds: {}
-              };
-
-              let request = aStore.mozGetAll(IDBKeyRange.lowerBound(aInternalRevisionId, true));
-              request.onsuccess = function(aEvent) {
-                for (let i = 0; i < aEvent.target.result.length; ++i) {
-                  let data = aEvent.target.result[i];
-
-                  switch (data.operation) {
-                    case REVISION_ADDED:
-                      changes.addedIds[data.objectId] = true;
-                      break;
-
-                    case REVISION_UPDATED:
-                      // We don't consider an update if this object has been added
-                      // or if it has been already modified by a previous
-                      // operation.
-                      if (!(data.objectId in changes.addedIds) &&
-                          !(data.objectId in changes.updatedIds)) {
-                        changes.updatedIds[data.objectId] = true;
-                      }
-                      break;
-
-                    case REVISION_REMOVED:
-                      let id = data.objectId;
-
-                      // If the object has been added in this range of revisions
-                      // we can ignore it and remove it from the list.
-                      if (id in changes.addedIds) {
-                        delete changes.addedIds[id];
-                      } else {
-                        changes.removedIds[id] = true;
-                      }
-
-                      if (id in changes.updatedIds) {
-                        delete changes.updatedIds[id];
-                      }
-                      break;
-                  }
-                }
-
-                // The last revisionId.
-                if (aEvent.target.result.length) {
-                  changes.revisionId = aEvent.target.result[aEvent.target.result.length - 1].revisionId;
-                }
-
-                // From maps to arrays.
-                changes.addedIds = Object.keys(changes.addedIds).map(function(aKey) { return parseInt(aKey, 10); });
-                changes.updatedIds = Object.keys(changes.updatedIds).map(function(aKey) { return parseInt(aKey, 10); });
-                changes.removedIds = Object.keys(changes.removedIds).map(function(aKey) { return parseInt(aKey, 10); });
-
-                let wrappedObject = ObjectWrapper.wrap(changes, self._window);
-                aResolve(wrappedObject);
-              };
-            }
-          );
-        },
-        function(aEvent) {
-          debug("GetChanges transaction failed");
-          aReject(createDOMError(self._window, aEvent));
-        }
-      );
-    });
-  },
-
   getLength: function() {
     let self = this;
 
diff --git a/dom/datastore/tests/file_basic.html b/dom/datastore/tests/file_basic.html
index addff1283c63..f6a8084429a7 100644
--- a/dom/datastore/tests/file_basic.html
+++ b/dom/datastore/tests/file_basic.html
@@ -39,7 +39,6 @@
       ok("remove" in store, "store.remove exists");
       ok("clear" in store, "store.clear exists");
       ok("revisionId" in store, "store.revisionId exists");
-      ok("getChanges" in store, "store.getChanges exists");
       ok("getLength" in store, "store.getLength exists");
       ok("sync" in store, "store.sync exists");
 
diff --git a/dom/datastore/tests/file_revision.html b/dom/datastore/tests/file_revision.html
deleted file mode 100644
index 8781412145b7..000000000000
--- a/dom/datastore/tests/file_revision.html
+++ /dev/null
@@ -1,196 +0,0 @@
-<!DOCTYPE HTML>
-<html>
-<head>
-  <meta charset="utf-8">
-  <title>Test for DataStore - basic operation on a readonly db</title>
-</head>
-<body>
-<p id="display"></p>
-<div id="content" style="display: none">
-
-</div>
-<pre id="test">
-  <script type="application/javascript;version=1.7">
-
-  var gStore;
-  var gPreviousRevisionId = '';
-
-  function is(a, b, msg) {
-    alert((a === b ? 'OK' : 'KO') + ' ' + msg)
-  }
-
-  function isnot(a, b, msg) {
-    alert((a !== b ? 'OK' : 'KO') + ' ' + msg)
-  }
-
-  function ok(a, msg) {
-    alert((a ? 'OK' : 'KO')+ ' ' + msg)
-  }
-
-  function cbError() {
-    alert('KO error');
-  }
-
-  function finish() {
-    alert('DONE');
-  }
-
-  function testGetDataStores() {
-    navigator.getDataStores('foo').then(function(stores) {
-      is(stores.length, 1, "getDataStores('foo') returns 1 element");
-      is(stores[0].name, 'foo', 'The dataStore.name is foo');
-      is(stores[0].readOnly, false, 'The dataStore foo is not in readonly');
-
-      gStore = stores[0];
-
-      runTest();
-    }, cbError);
-  }
-
-  function testStoreAdd(value, expectedId) {
-    return gStore.add(value).then(function(id) {
-      is(id, expectedId, "store.add() is called");
-      runTest();
-    }, cbError);
-  }
-
-  function testStoreUpdate(id, value) {
-    return gStore.update(id, value).then(function(retId) {
-      is(id, retId, "store.update() is called with the right id");
-      runTest();
-    }, cbError);
-  }
-
-  function testStoreRemove(id, expectedSuccess) {
-    return gStore.remove(id).then(function(success) {
-      is(success, expectedSuccess, "store.remove() returns the right value");
-      runTest();
-    }, cbError);
-  }
-
-  function testStoreRevisionId() {
-    is(/[0-9a-zA-Z]{8}-[0-9a-zA-Z]{4}-[0-9a-zA-Z]{4}-[0-9a-zA-Z]{4}-[0-9a-zA-Z]{12}/.test(gStore.revisionId), true, "store.revisionId returns something");
-    runTest();
-  }
-
-  function testStoreWrongRevisions(id) {
-    return gStore.getChanges(id).then(
-      function(what) {
-        is(what, undefined, "Wrong revisionId == undefined object");
-        runTest();
-      }, cbError);
-  }
-
-  function testStoreRevisions(id, changes) {
-    return gStore.getChanges(id).then(function(what) {
-      is(JSON.stringify(changes.addedIds),
-         JSON.stringify(what.addedIds), "store.revisions - addedIds: " +
-         JSON.stringify(what.addedIds) + " | " + JSON.stringify(changes.addedIds));
-      is(JSON.stringify(changes.updatedIds),
-         JSON.stringify(what.updatedIds), "store.revisions - updatedIds: " +
-         JSON.stringify(what.updatedIds) + " | " + JSON.stringify(changes.updatedIds));
-      is(JSON.stringify(changes.removedIds),
-         JSON.stringify(what.removedIds), "store.revisions - removedIds: " +
-         JSON.stringify(what.removedIds) + " | " + JSON.stringify(changes.removedIds));
-      runTest();
-    }, cbError);
-  }
-
-  function testStoreRevisionIdChanged() {
-    isnot(gStore.revisionId, gPreviousRevisionId, "Revision changed");
-    gPreviousRevisionId = gStore.revisionId;
-    runTest();
-  }
-
-  function testStoreRevisionIdNotChanged() {
-    is(gStore.revisionId, gPreviousRevisionId, "Revision changed");
-    runTest();
-  }
-
-  var revisions = [];
-
-  var tests = [
-    // Test for GetDataStore
-    testGetDataStores,
-
-    // The first revision is not empty
-    testStoreRevisionIdChanged,
-
-    // wrong revision ID
-    function() { testStoreWrongRevisions('foobar'); },
-
-    // Add
-    function() { testStoreAdd({ number: 42 }, 1); },
-    function() { revisions.push(gStore.revisionId); testStoreRevisionId(); },
-    testStoreRevisionIdChanged,
-    function() { testStoreRevisions(revisions[0], { addedIds: [], updatedIds: [], removedIds: [] }); },
-
-    // Add
-    function() { testStoreAdd({ number: 42 }, 2); },
-    function() { revisions.push(gStore.revisionId); runTest(); },
-    testStoreRevisionIdChanged,
-    function() { testStoreRevisions(revisions[0], { addedIds: [2], updatedIds: [], removedIds: [] }); },
-    function() { testStoreRevisions(revisions[1], { addedIds: [], updatedIds: [], removedIds: [] }); },
-
-    // Add
-    function() { testStoreAdd({ number: 42 }, 3); },
-    function() { revisions.push(gStore.revisionId); runTest(); },
-    testStoreRevisionIdChanged,
-    function() { testStoreRevisions(revisions[0], { addedIds: [2,3], updatedIds: [], removedIds: [] }); },
-    function() { testStoreRevisions(revisions[1], { addedIds: [3], updatedIds: [], removedIds: [] }); },
-    function() { testStoreRevisions(revisions[2], { addedIds: [], updatedIds: [], removedIds: [] }); },
-
-    // Update
-    function() { testStoreUpdate(3, { number: 43 }); },
-    function() { revisions.push(gStore.revisionId); runTest(); },
-    testStoreRevisionIdChanged,
-    function() { testStoreRevisions(revisions[0], { addedIds: [2,3], updatedIds: [], removedIds: [] }); },
-    function() { testStoreRevisions(revisions[1], { addedIds: [3], updatedIds: [], removedIds: [] }); },
-    function() { testStoreRevisions(revisions[2], { addedIds: [], updatedIds: [3], removedIds: [] }); },
-    function() { testStoreRevisions(revisions[3], { addedIds: [], updatedIds: [], removedIds: [] }); },
-
-    // Update
-    function() { testStoreUpdate(3, { number: 42 }); },
-    function() { revisions.push(gStore.revisionId); runTest(); },
-    testStoreRevisionIdChanged,
-    function() { testStoreRevisions(revisions[0], { addedIds: [2,3], updatedIds: [], removedIds: [] }); },
-    function() { testStoreRevisions(revisions[1], { addedIds: [3], updatedIds: [], removedIds: [] }); },
-    function() { testStoreRevisions(revisions[2], { addedIds: [], updatedIds: [3], removedIds: [] }); },
-    function() { testStoreRevisions(revisions[3], { addedIds: [], updatedIds: [3], removedIds: [] }); },
-    function() { testStoreRevisions(revisions[4], { addedIds: [], updatedIds: [], removedIds: [] }); },
-
-    // Remove
-    function() { testStoreRemove(3, true); },
-    function() { revisions.push(gStore.revisionId); runTest(); },
-    testStoreRevisionIdChanged,
-    function() { testStoreRevisions(revisions[0], { addedIds: [2], updatedIds: [], removedIds: [] }); },
-    function() { testStoreRevisions(revisions[1], { addedIds: [], updatedIds: [], removedIds: [] }); },
-    function() { testStoreRevisions(revisions[2], { addedIds: [], updatedIds: [], removedIds: [3] }); },
-    function() { testStoreRevisions(revisions[3], { addedIds: [], updatedIds: [], removedIds: [3] }); },
-    function() { testStoreRevisions(revisions[4], { addedIds: [], updatedIds: [], removedIds: [3] }); },
-    function() { testStoreRevisions(revisions[5], { addedIds: [], updatedIds: [], removedIds: [] }); },
-
-    function() { testStoreRemove(3, false); },
-    testStoreRevisionIdNotChanged,
-
-    // Remove
-    function() { testStoreRemove(42, false); },
-    testStoreRevisionIdNotChanged,
-  ];
-
-  function runTest() {
-    if (!tests.length) {
-      finish();
-      return;
-    }
-
-    var test = tests.shift();
-    test();
-  }
-
-  runTest();
-  </script>
-</pre>
-</body>
-</html>
-
diff --git a/dom/datastore/tests/mochitest.ini b/dom/datastore/tests/mochitest.ini
index cf3056acfce1..a13df2499244 100644
--- a/dom/datastore/tests/mochitest.ini
+++ b/dom/datastore/tests/mochitest.ini
@@ -3,7 +3,6 @@ support-files =
   file_app_install.html
   file_readonly.html
   file_basic.html
-  file_revision.html
   file_changes.html
   file_changes2.html
   file_app.sjs
@@ -16,7 +15,6 @@ support-files =
 [test_app_install.html]
 [test_readonly.html]
 [test_basic.html]
-[test_revision.html]
 [test_changes.html]
 [test_arrays.html]
 [test_oop.html]
diff --git a/dom/datastore/tests/test_revision.html b/dom/datastore/tests/test_revision.html
deleted file mode 100644
index 23846c8469b7..000000000000
--- a/dom/datastore/tests/test_revision.html
+++ /dev/null
@@ -1,140 +0,0 @@
-<!DOCTYPE HTML>
-<html>
-<head>
-  <meta charset="utf-8">
-  <title>Test for DataStore - basic operation on a readonly db</title>
-  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
-  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
-</head>
-<body>
-<p id="display"></p>
-<div id="content" style="display: none">
-
-</div>
-<pre id="test">
-  <script type="application/javascript;version=1.7">
-
-  var gBaseURL = 'http://test/tests/dom/datastore/tests/';
-  var gHostedManifestURL = gBaseURL + 'file_app.sjs?testToken=file_revision.html';
-  var gApp;
-  var gStore;
-  var gPreviousRevisionId = '';
-
-  function cbError() {
-    ok(false, "Error callback invoked");
-    finish();
-  }
-
-  function installApp() {
-    var request = navigator.mozApps.install(gHostedManifestURL);
-    request.onerror = cbError;
-    request.onsuccess = function() {
-      gApp = request.result;
-      runTest();
-    }
-  }
-
-  function uninstallApp() {
-    // Uninstall the app.
-    var request = navigator.mozApps.mgmt.uninstall(gApp);
-    request.onerror = cbError;
-    request.onsuccess = function() {
-      // All done.
-      ok(true, "All done");
-      runTest();
-    }
-  }
-
-  function testApp() {
-    var ifr = document.createElement('iframe');
-    ifr.setAttribute('mozbrowser', 'true');
-    ifr.setAttribute('mozapp', gApp.manifestURL);
-    ifr.setAttribute('src', gApp.manifest.launch_path);
-    var domParent = document.getElementById('content');
-
-    // Set us up to listen for messages from the app.
-    var listener = function(e) {
-      var message = e.detail.message;
-      if (/^OK/.exec(message)) {
-        ok(true, "Message from app: " + message);
-      } else if (/KO/.exec(message)) {
-        ok(false, "Message from app: " + message);
-      } else if (/DONE/.exec(message)) {
-        ok(true, "Messaging from app complete");
-        ifr.removeEventListener('mozbrowsershowmodalprompt', listener);
-        domParent.removeChild(ifr);
-        runTest();
-      }
-    }
-
-    // This event is triggered when the app calls "alert".
-    ifr.addEventListener('mozbrowsershowmodalprompt', listener, false);
-    domParent.appendChild(ifr);
-  }
-
-  var revisions = [];
-
-  var tests = [
-    // Permissions
-    function() {
-      SpecialPowers.pushPermissions(
-        [{ "type": "browser", "allow": 1, "context": document },
-         { "type": "embed-apps", "allow": 1, "context": document },
-         { "type": "webapps-manage", "allow": 1, "context": document }], runTest);
-    },
-
-    // Preferences
-    function() {
-      SpecialPowers.pushPrefEnv({"set": [["dom.promise.enabled", true]]}, runTest);
-    },
-
-    function() {
-      SpecialPowers.pushPrefEnv({"set": [["dom.datastore.enabled", true]]}, runTest);
-    },
-
-    // Enabling mozBrowser
-    function() {
-      SpecialPowers.setAllAppsLaunchable(true);
-      SpecialPowers.pushPrefEnv({"set": [["dom.mozBrowserFramesEnabled", true]]}, runTest);
-    },
-
-    // No confirmation needed when an app is installed
-    function() {
-      SpecialPowers.autoConfirmAppInstall(runTest);
-    },
-
-    // Installing the app
-    installApp,
-
-    // Run tests in app
-    testApp,
-
-    // Uninstall the app
-    uninstallApp
-  ];
-
-  function runTest() {
-    if (!tests.length) {
-      finish();
-      return;
-    }
-
-    var test = tests.shift();
-    test();
-  }
-
-  function finish() {
-    SimpleTest.finish();
-  }
-
-  if (SpecialPowers.isMainProcess()) {
-    SpecialPowers.Cu.import("resource://gre/modules/DataStoreChangeNotifier.jsm");
-  }
-
-  SimpleTest.waitForExplicitFinish();
-  runTest();
-  </script>
-</pre>
-</body>
-</html>
-
diff --git a/dom/webidl/DataStore.webidl b/dom/webidl/DataStore.webidl
index 320bb0ddd503..f2372d9ed7c7 100644
--- a/dom/webidl/DataStore.webidl
+++ b/dom/webidl/DataStore.webidl
@@ -39,22 +39,12 @@ interface DataStore : EventTarget {
 
   attribute EventHandler onchange;
 
-  // Promise<DataStoreChanges>
-  Promise getChanges(DOMString revisionId);
-
   // Promise<unsigned long>
   Promise getLength();
 
   DataStoreCursor sync(optional DOMString revisionId = "");
 };
 
-dictionary DataStoreChanges {
-  DOMString revisionId;
-  sequence<unsigned long> addedIds;
-  sequence<unsigned long> updatedIds;
-  sequence<unsigned long> removedIds;
-};
-
 [Pref="dom.datastore.enabled",
  JSImplementation="@mozilla.org/dom/datastore-cursor;1"]
 interface DataStoreCursor {