diff --git a/frontends/src/constants.py b/frontends/src/constants.py
index 9de5b0a7..2114f178 100644
--- a/frontends/src/constants.py
+++ b/frontends/src/constants.py
@@ -18,6 +18,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
+from sat.core import constants
 from sat.core.i18n import _, D_
 
 try:
@@ -50,7 +51,8 @@ def getPresence():
     return presence
 
 
-class Const(object):
+class Const(constants.Const):
+
     PRESENCE = getPresence()
 
     MENU_NORMAL = "NORMAL"
@@ -60,8 +62,6 @@ class Const(object):
     SYNTAX_CURRENT = "@CURRENT@"
     SYNTAX_TEXT = "text"
 
-    NO_SECURITY_LIMIT = -1
-
     # XMLUI
     SAT_FORM_PREFIX = "SAT_FORM_"
     SAT_PARAM_SEPARATOR = "_XMLUI_PARAM_"  # used to have unique elements names
diff --git a/src/core/constants.py b/src/core/constants.py
index cf29bed0..5ea7f94a 100644
--- a/src/core/constants.py
+++ b/src/core/constants.py
@@ -18,7 +18,11 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import os.path
-from xdg import BaseDirectory
+try:
+    from xdg import BaseDirectory
+except ImportError:
+    # Catch JS runtime error while using Libervia
+    BaseDirectory = None
 
 
 class Const(object):
@@ -27,9 +31,8 @@ class Const(object):
     APP_NAME = u'Salut à Toi'
     APP_NAME_SHORT = u'SàT'
     APP_NAME_FULL = u'%s (%s)' % (APP_NAME_SHORT, APP_NAME)
-    APP_VERSION = u'0.4.1D' # Please add 'D' at the end for dev versions
-    APP_URL = 'http://www.salut-a-toi.org'
-
+    APP_VERSION = u'0.4.1D'  # Please add 'D' at the end for dev versions
+    APP_URL = 'http://salut-a-toi.org'
 
     ## Parameters ##
     NO_SECURITY_LIMIT = -1
@@ -44,26 +47,26 @@ class Const(object):
     ENTITY_LAST_RESOURCE = 'LAST_RESOURCE'
     ENTITY_CAP_HASH = 'CAP_HASH'
 
+    if BaseDirectory:  # skipped when imported from Libervia browser_side
 
-    ## Configuration ##
-    DEFAULT_CONFIG = {
-        'media_dir': '/usr/share/sat/media',
-        'pid_dir': '/tmp',
-        'log_dir': BaseDirectory.save_data_path('sat'),
-    }
+        ## Configuration ##
+        DEFAULT_CONFIG = {
+            'media_dir': '/usr/share/sat/media',
+            'pid_dir': '/tmp',
+            'log_dir': BaseDirectory.save_data_path('sat'),
+        }
 
-    # XXX: tmp update code, will be removed in the future
-    # When you remove this, please add that in DEFAULT_CONFIG:
-    # 'local_dir': BaseDirectory.save_data_path('sat'),
-    # and also remove sat.memory.memory.Memory.__fixLocalDir
-    DEFAULT_LOCAL_DIR = BaseDirectory.save_data_path('sat')
-
-    # List of the configuration filenames sorted by ascending priority
-    CONFIG_FILES = [(os.path.expanduser(path) + 'sat.conf') for path in \
-                    ['/etc/', '~/', '~/.', '', '.'] + \
-                    ['%s/' % path for path in list(BaseDirectory.load_config_paths('sat'))]
-                    ]
+        # XXX: tmp update code, will be removed in the future
+        # When you remove this, please add that in DEFAULT_CONFIG:
+        # 'local_dir': BaseDirectory.save_data_path('sat'),
+        # and also remove sat.memory.memory.Memory.__fixLocalDir
+        DEFAULT_LOCAL_DIR = BaseDirectory.save_data_path('sat')
 
+        # List of the configuration filenames sorted by ascending priority
+        CONFIG_FILES = [(os.path.expanduser(path) + 'sat.conf') for path in \
+                        ['/etc/', '~/', '~/.', '', '.'] + \
+                        ['%s/' % path for path in list(BaseDirectory.load_config_paths('sat'))]
+                        ]
 
     ## Plugins ##
     # names of widely used plugins