diff --git a/docs/changelog.rst b/docs/changelog.rst
index 6d7da9d4..c5dc8150 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -35,6 +35,17 @@ Bug fix release.
 
 - Configuration: :option:`mopidy --config` now supports directories.
 
+- Network: Fix a race condition where two threads could try to free the same
+  data simultaneously. (Fixes: :issue:`781`)
+
+- Backend API: Update :meth:`mopidy.backend.LibraryProvider.browse` signature
+  and docs to match how the core use the backend's browse method. (Fixes:
+  :issue:`833`)
+
+- Local library API: Add :attr:`mopidy.local.ROOT_DIRECTORY_URI` constant for
+  use by implementors of :method:`mopidy.local.Library.browse`. (Related to:
+  :issue:`833`)
+
 
 v0.19.3 (2014-08-03)
 ====================
diff --git a/mopidy/backend/__init__.py b/mopidy/backend/__init__.py
index 845eac11..712bfafe 100644
--- a/mopidy/backend/__init__.py
+++ b/mopidy/backend/__init__.py
@@ -81,12 +81,12 @@ class LibraryProvider(object):
     def __init__(self, backend):
         self.backend = backend
 
-    def browse(self, path):
+    def browse(self, uri):
         """
         See :meth:`mopidy.core.LibraryController.browse`.
 
         If you implement this method, make sure to also set
-        :attr:`root_directory_name`.
+        :attr:`root_directory`.
 
         *MAY be implemented by subclass.*
         """
diff --git a/mopidy/local/__init__.py b/mopidy/local/__init__.py
index 8b4a8b1f..7f4cd03f 100644
--- a/mopidy/local/__init__.py
+++ b/mopidy/local/__init__.py
@@ -46,6 +46,15 @@ class Extension(ext.Extension):
         return LocalCommand()
 
 
+ROOT_DIRECTORY_URI = 'local:directory'
+"""
+URI of the local backend's root directory.
+
+This constant should be used by libraries implementing the
+:meth:`Library.browse` method.
+"""
+
+
 class Library(object):
     """
     Local library interface.
@@ -64,11 +73,14 @@ class Library(object):
     def __init__(self, config):
         self._config = config
 
-    def browse(self, path):
+    def browse(self, uri):
         """
-        Browse directories and tracks at the given path.
+        Browse directories and tracks at the given URI.
 
-        :param string path: path to browse or None for root.
+        The URI for the root directory is a constant available at
+        :attr:`ROOT_DIRECTORY_URI`.
+
+        :param string path: URI to browse.
         :rtype: List of :class:`~mopidy.models.Ref` tracks and directories.
         """
         raise NotImplementedError
diff --git a/mopidy/local/json.py b/mopidy/local/json.py
index 927f8898..1bb55389 100644
--- a/mopidy/local/json.py
+++ b/mopidy/local/json.py
@@ -61,8 +61,7 @@ class _BrowseCache(object):
     splitpath_re = re.compile(r'([^/]+)')
 
     def __init__(self, uris):
-        # TODO: local.ROOT_DIRECTORY_URI
-        self._cache = {'local:directory': collections.OrderedDict()}
+        self._cache = {local.ROOT_DIRECTORY_URI: collections.OrderedDict()}
 
         for track_uri in uris:
             path = translator.local_track_uri_to_path(track_uri, b'/')
@@ -97,10 +96,10 @@ class _BrowseCache(object):
             else:
                 # Loop completed, so final child needs to be added to root.
                 if child:
-                    self._cache['local:directory'][child.uri] = child
+                    self._cache[local.ROOT_DIRECTORY_URI][child.uri] = child
                 # If no parent was set we belong in the root.
                 if not parent_uri:
-                    parent_uri = 'local:directory'
+                    parent_uri = local.ROOT_DIRECTORY_URI
 
             self._cache[parent_uri][track_uri] = track_ref
 
diff --git a/mopidy/local/library.py b/mopidy/local/library.py
index a626f566..cf312883 100644
--- a/mopidy/local/library.py
+++ b/mopidy/local/library.py
@@ -2,7 +2,7 @@ from __future__ import unicode_literals
 
 import logging
 
-from mopidy import backend, models
+from mopidy import backend, local, models
 
 logger = logging.getLogger(__name__)
 
@@ -10,18 +10,18 @@ logger = logging.getLogger(__name__)
 class LocalLibraryProvider(backend.LibraryProvider):
     """Proxy library that delegates work to our active local library."""
 
-    root_directory = models.Ref.directory(uri=b'local:directory',
-                                          name='Local media')
+    root_directory = models.Ref.directory(
+        uri=local.ROOT_DIRECTORY_URI, name='Local media')
 
     def __init__(self, backend, library):
         super(LocalLibraryProvider, self).__init__(backend)
         self._library = library
         self.refresh()
 
-    def browse(self, path):
+    def browse(self, uri):
         if not self._library:
             return []
-        return self._library.browse(path)
+        return self._library.browse(uri)
 
     def refresh(self, uri=None):
         if not self._library:
diff --git a/mopidy/utils/network.py b/mopidy/utils/network.py
index 11469b47..4ea25026 100644
--- a/mopidy/utils/network.py
+++ b/mopidy/utils/network.py
@@ -268,8 +268,8 @@ class Connection(object):
             return True
 
         if not data:
-            self.actor_ref.tell({'close': True})
             self.disable_recv()
+            self.actor_ref.tell({'close': True})
             return True
 
         try:
diff --git a/tests/utils/network/test_connection.py b/tests/utils/network/test_connection.py
index 7a25643f..c3200689 100644
--- a/tests/utils/network/test_connection.py
+++ b/tests/utils/network/test_connection.py
@@ -7,7 +7,7 @@ import unittest
 
 import gobject
 
-from mock import Mock, patch, sentinel
+from mock import Mock, call, patch, sentinel
 
 import pykka
 
@@ -418,8 +418,11 @@ class ConnectionTest(unittest.TestCase):
 
         self.assertTrue(network.Connection.recv_callback(
             self.mock, sentinel.fd, gobject.IO_IN))
-        self.mock.actor_ref.tell.assert_called_once_with({'close': True})
-        self.mock.disable_recv.assert_called_once_with()
+        self.assertEqual(self.mock.mock_calls, [
+            call.sock.recv(any_int),
+            call.disable_recv(),
+            call.actor_ref.tell({'close': True}),
+        ])
 
     def test_recv_callback_recoverable_error(self):
         self.mock.sock = Mock(spec=socket.SocketType)