Comment # 6 on bug 908519 from Michele Cherici

Starting with -safe-mode unfortunately doesn't solve the problems in my case.
This is what is showed in console after start with -safe-mode:

(process:15414): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size
== 0' failed
System JS : ERROR resource://app/components/nsBrowserGlue.js:1529 -
NS_ERROR_FILE_NOT_FOUND: Component returned failure code: 0x80520012
(NS_ERROR_FILE_NOT_FOUND) [nsIPrefBranch.getComplexValue]
System JS : WARNING resource://services-common/async.js:199 - mutating the
[[Prototype]] of an object will cause your code to run very slowly; instead
create the object with the correct initial [[Prototype]] value using
Object.create
1418112712482   Sync.Engine.Tabs        ERROR   null
System JS : ERROR resource:///modules/sessionstore/SessionStore.jsm:1508 -
NS_ERROR_ILLEGAL_VALUE: Default view is not tracked
1418112712739   Sync.Engine.Tabs        ERROR   null
System JS : ERROR resource:///modules/sessionstore/SessionStore.jsm:1508 -
NS_ERROR_ILLEGAL_VALUE: Default view is not tracked
System JS : ERROR resource:///modules/sessionstore/SessionStore.jsm:1508 -
NS_ERROR_ILLEGAL_VALUE: Default view is not tracked
1418112755539   GMPInstallManager.simpleCheckAndInstall INFO    Last check was:
86119 seconds ago, minimum seconds: 86400
1418112755539   GMPInstallManager.simpleCheckAndInstall INFO    Will not check
for updates.
System JS : ERROR resource://app/modules/WebappManager.jsm:43 -
NS_ERROR_FAILURE: Component returned failure code: 0x80004005
(NS_ERROR_FAILURE) [nsIObserverService.removeObserver]