Hier ein Auszug aus dem Error Log, vielleicht sieht ja jemand mehr als ich und kann mir einen Tipp geben:
1441963083407 Sync.Engine.Bookmarks ERROR null
1441963096615 Sync.Engine.Bookmarks WARN Got exception "[Exception... "Component returned failure code: 0x804b000a (NS_ERROR_MALFORMED_URI) [nsINavBookmarksService.getBookmarkURI]" nsresult: "0x804b000a (NS_ERROR_MALFORMED_URI)" location: "JS frame :: resource://gre/modules/services-sync/engines/bookmarks.js :: _buildGUIDMap :: line 275" data: no] Stack trace: _buildGUIDMap()@resource://gre/modules/services-sync/engines/bookmarks.js:275 < _syncStart/<()@resource://gre/modules/services-sync/engines/bookmarks.js:402 < _mapDupe()@resource://gre/modules/services-sync/engines/bookmarks.js:342 < _createRecord()@resource://gre/modules/services-sync/engines/bookmarks.js:442 < SyncEngine.prototype._reconcile()@resource://services-sync/engines.js:1374 < SyncEngine.prototype._processIncoming/newitems.recordHandler()@resource://services-sync/engines.js:1080 < Collection.prototype.recordHandler/this._onProgress()@resource://services-sync/record.js:624 < Channel_onDataAvail()@resource://services-sync/resource.js:558 < waitForSyncCallback()@resource://services-common/async.js:102 < Res__request()@resource://services-sync/resource.js:405 < Res_get()@resource://services-sync/resource.js:429 < SyncEngine.prototype._processIncoming()@resource://services-sync/engines.js:1108 < BookmarksEngine.prototype._processIncoming()@resource://gre/modules/services-sync/engines/bookmarks.js:419 < SyncEngine.prototype._sync()@resource://services-sync/engines.js:1520 < wrappedSync()@resource://gre/modules/services-sync/engines/bookmarks.js:229 < _sync()@resource://gre/modules/services-sync/engines/bookmarks.js:226 < WrappedNotify()@resource://services-sync/util.js:148 < Engine.prototype.sync()@resource://services-sync/engines.js:668 < _syncEngine()@resource://services-sync/stages/enginesync.js:199 < sync()@resource://services-sync/stages/enginesync.js:149 < onNotify()@resource://gre/modules/services-sync/service.js:1298 < WrappedNotify()@resource://services-sync/util.js:148 < WrappedLock()@resource://services-sync/util.js:103 < _lockedSync()@resource://gre/modules/services-sync/service.js:1288 < sync/<()@resource://gre/modules/services-sync/service.js:1280 < WrappedCatch()@resource://services-sync/util.js:77 < sync()@resource://gre/modules/services-sync/service.js:1268 < <file:unknown>" building GUID map. Skipping all other incoming items.
1441963096616 Sync.Engine.Bookmarks WARN Reconciliation failed: aborting incoming processing.
1441963096616 Sync.Collection DEBUG mesg: GET success 200 https://sync-190-us-west-2.sync.services.mozilla.com/1.5/17661316/storage/bookmarks?full=1&sort=index
1441963096617 Sync.Collection DEBUG GET success 200 https://sync-190-us-west-2.sync.services.mozilla.com/1.5/17661316/storage/bookmarks?full=1&sort=index
1441963096617 Sync.Engine.Bookmarks DEBUG Records that failed to apply: k4A7UtB0X9JP
1441963096741 Sync.Status DEBUG Status for engine bookmarks: error.engine.reason.unknown_fail
1441963096741 Sync.Status DEBUG Status.service: success.status_ok => error.sync.failed_partial
1441963096743 Sync.ErrorHandler DEBUG bookmarks failed: [Exception... "Component returned failure code: 0x804b000a (NS_ERROR_MALFORMED_URI) [nsINavBookmarksService.getBookmarkURI]" nsresult: "0x804b000a (NS_ERROR_MALFORMED_URI)" location: "JS frame :: resource://gre/modules/services-sync/engines/bookmarks.js :: _buildGUIDMap :: line 275" data: no] Stack trace: _buildGUIDMap()@resource://gre/modules/services-sync/engines/bookmarks.js:275 < _syncStart/<()@resource://gre/modules/services-sync/engines/bookmarks.js:402 < _mapDupe()@resource://gre/modules/services-sync/engines/bookmarks.js:342 < _createRecord()@resource://gre/modules/services-sync/engines/bookmarks.js:442 < SyncEngine.prototype._reconcile()@resource://services-sync/engines.js:1374 < SyncEngine.prototype._processIncoming/newitems.recordHandler()@resource://services-sync/engines.js:1080 < Collection.prototype.recordHandler/this._onProgress()@resource://services-sync/record.js:624 < Channel_onDataAvail()@resource://services-sync/resource.js:558 < waitForSyncCallback()@resource://services-common/async.js:102 < Res__request()@resource://services-sync/resource.js:405 < Res_get()@resource://services-sync/resource.js:429 < SyncEngine.prototype._processIncoming()@resource://services-sync/engines.js:1108 < BookmarksEngine.prototype._processIncoming()@resource://gre/modules/services-sync/engines/bookmarks.js:419 < SyncEngine.prototype._sync()@resource://services-sync/engines.js:1520 < wrappedSync()@resource://gre/modules/services-sync/engines/bookmarks.js:229 < _sync()@resource://gre/modules/services-sync/engines/bookmarks.js:226 < WrappedNotify()@resource://services-sync/util.js:148 < Engine.prototype.sync()@resource://services-sync/engines.js:668 < _syncEngine()@resource://services-sync/stages/enginesync.js:199 < sync()@resource://services-sync/stages/enginesync.js:149 < onNotify()@resource://gre/modules/services-sync/service.js:1298 < WrappedNotify()@resource://services-sync/util.js:148 < WrappedLock()@resource://services-sync/util.js:103 < _lockedSync()@resource://gre/modules/services-sync/service.js:1288 < sync/<()@resource://gre/modules/services-sync/service.js:1280 < WrappedCatch()@resource://services-sync/util.js:77 < sync()@resource://gre/modules/services-sync/service.js:1268 < <file:unknown>
1441963096744 Sync.Engine.Forms INFO 0 outgoing items pre-reconciliation
1441963096745 Sync.Engine.Forms INFO Records: 0 applied, 0 successfully, 0 failed to apply, 0 newly failed to apply, 0 reconciled.
1441963096746 Sync.Engine.History INFO 8 outgoing items pre-reconciliation
1441963096747 Sync.Engine.History INFO Records: 0 applied, 0 successfully, 0 failed to apply, 0 newly failed to apply, 0 reconciled.
1441963096784 Sync.Engine.Bookmarks ERROR null
1441963096815 Sync.Engine.History INFO Uploading all of 8 records
1441963096815 Sync.BrowserIDManager DEBUG _ensureValidToken already has one
1441963096818 Sync.Collection DEBUG POST Length: 4517
1441963097397 Sync.Collection DEBUG mesg: POST success 200 https://sync-190-us-west-2.sync.services.mozilla.com/1.5/17661316/storage/history
1441963097397 Sync.Collection DEBUG POST success 200 https://sync-190-us-west-2.sync.services.mozilla.com/1.5/17661316/storage/history
1441963097398 Sync.Synchronizer INFO Sync completed at 2015-09-11 11:18:17 after 42.81 secs.
1441963097400 Sync.Declined DEBUG Handling remote declined: ["passwords","prefs","addons"]
1441963097400 Sync.Declined DEBUG Handling local declined: ["passwords","prefs","addons"]
1441963097400 Sync.Declined DEBUG Declined changed? false
1441963097401 Sync.Service INFO No change to declined engines. Not reuploading meta/global.
1441963097403 Sync.SyncScheduler DEBUG Next sync in 600000 ms.
1441963097403 Sync.ErrorHandler DEBUG Some engines did not sync correctly.
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Ich hoffe da steht nichts Geheimes drin, was ich nicht erkenne 
Oder hier:
1441988698897 Sync.Tracker.History DEBUG Saving changed IDs to history
1441988706553 Sync.Tracker.History DEBUG Saving changed IDs to history
1441988708939 Sync.Tracker.History DEBUG Saving changed IDs to history
1441989065429 Sync.SyncScheduler DEBUG Global Score threshold hit, triggering sync.
1441989065442 Sync.Service DEBUG User-Agent: Firefox/40.0.3 FxSync/1.42.0.20150826023504.
1441989065442 Sync.Service INFO Starting sync at 2015-09-11 18:31:05
1441989065444 Sync.SyncScheduler DEBUG Clearing sync triggers and the global score.
1441989065446 Sync.Status INFO Resetting Status.
1441989065447 Sync.Status DEBUG Status.service: success.status_ok => success.status_ok
1441989065449 FirefoxAccounts DEBUG already verified
1441989065449 Sync.BrowserIDManager INFO Getting an assertion from: https://token.services.mozilla.com/1.0/sync/1.5
1441989065450 FirefoxAccounts DEBUG enter getAssertion()
1441989065571 Sync.SyncScheduler DEBUG Next sync in 600000 ms.
1441989065597 FirefoxAccounts DEBUG getKeyPair: already have a keyPair
1441989065597 FirefoxAccounts DEBUG getCertificate already had one
1441989065598 FirefoxAccounts DEBUG getAssertionFromCert
1441989065602 FirefoxAccounts DEBUG getAssertionFromCert returning signed: true
1441989065602 Sync.BrowserIDManager DEBUG Getting a token
1441989065605 Common.TokenServerClient DEBUG Beginning BID assertion exchange: https://token.services.mozilla.com/1.0/sync/1.5
1441989066360 Sync.Tracker.Passwords DEBUG Saving changed IDs to passwords
1441989066443 Sync.Tracker.Forms DEBUG Saving changed IDs to forms
1441989069383 Sync.SyncScheduler DEBUG Global Score threshold hit, triggering sync.
1441989069412 Sync.Service DEBUG User-Agent: Firefox/40.0.3 FxSync/1.42.0.20150826023504.
1441989069412 Sync.Service INFO Starting sync at 2015-09-11 18:31:09
1441989069413 Sync.Service DEBUG Exception: Could not acquire lock. Label: "service.js: sync". No traceback available
1441989069413 Sync.Service INFO Cannot start sync: already syncing?
1441989070477 Sync.Tracker.Passwords DEBUG Saving changed IDs to passwords
1441989071294 Sync.SyncScheduler DEBUG Global Score threshold hit, triggering sync.
1441989071296 Sync.Service DEBUG User-Agent: Firefox/40.0.3 FxSync/1.42.0.20150826023504.
1441989071296 Sync.Service INFO Starting sync at 2015-09-11 18:31:11
1441989071297 Sync.Service DEBUG Exception: Could not acquire lock. Label: "service.js: sync". No traceback available
1441989071297 Sync.Service INFO Cannot start sync: already syncing?
1441989077885 Sync.SyncScheduler DEBUG Global Score threshold hit, triggering sync.
1441989077903 Sync.Service DEBUG User-Agent: Firefox/40.0.3 FxSync/1.42.0.20150826023504.
1441989077903 Sync.Service INFO Starting sync at 2015-09-11 18:31:17
1441989077903 Sync.Service DEBUG Exception: Could not acquire lock. Label: "service.js: sync". No traceback available
1441989077903 Sync.Service INFO Cannot start sync: already syncing?
1441989078298 Common.TokenServerClient DEBUG Got token response: 408
1441989078298 Sync.RESTResponse TRACE Processing response headers.
1441989078298 Common.TokenServerClient WARN Did not receive JSON response. Misconfigured server?
1441989078298 Common.TokenServerClient DEBUG Content-Type:
1441989078298 Common.TokenServerClient DEBUG Body:
1441989078299 Sync.BrowserIDManager ERROR Non-authentication error in _fetchTokenForUser: TokenServerClientServerError({"now":"2015-09-11T16:31:18.299Z","message":"Non-JSON response.","cause":"malformed-response","response_body":"","response_headers":{"content-length":"0","connection":"Close"},"response_status":408}) (resource://gre/modules/services-common/tokenserverclient.js:36:35) JS Stack trace: @tokenserverclient.js:36:36 < @browserid_identity.js:14:1 < @status.js:15:1 < initSync@sync.js:26:3 < @sync.js:3:11 < @greasemonkey.js:15:1
1441989078300 Sync.Status DEBUG Status.login: success.login => error.login.reason.network
1441989078300 Sync.Status DEBUG Status.service: success.status_ok => error.login.failed
1441989078305 Sync.BrowserIDManager ERROR Failed to fetch a token for authentication: TokenServerClientServerError({"now":"2015-09-11T16:31:18.299Z","message":"Non-JSON response.","cause":"malformed-response","response_body":"","response_headers":{"content-length":"0","connection":"Close"},"response_status":408}) (resource://gre/modules/services-common/tokenserverclient.js:36:35) JS Stack trace: @tokenserverclient.js:36:36 < @browserid_identity.js:14:1 < @status.js:15:1 < initSync@sync.js:26:3 < @sync.js:3:11 < @greasemonkey.js:15:1
1441989078751 Sync.Tracker.Passwords DEBUG Saving changed IDs to passwords
1441989080769 Sync.Resource DEBUG mesg: GET fail 401 https://sync-190-us-west-2.sync.services.mozilla.com/1.5/17661316/info/collections
1441989080769 Sync.Resource DEBUG GET fail 401 https://sync-190-us-west-2.sync.services.mozilla.com/1.5/17661316/info/collections
1441989080769 Sync.Service INFO Logging out
1441989080774 Sync.SyncScheduler DEBUG Global Score threshold hit, triggering sync.
1441989080774 Sync.ErrorHandler INFO Got 401 response; resetting clusterURL.
1441989080775 Sync.ErrorHandler DEBUG New mid-sync 401 failure. Making a note.
1441989080775 Sync.ErrorHandler INFO Attempting to schedule another sync.
1441989080780 Sync.SyncScheduler DEBUG Next sync in 600000 ms.
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