diff -r 000000000000 -r 6474c204b198 extensions/cookie/test/unit/test_permmanager_local_files.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/extensions/cookie/test/unit/test_permmanager_local_files.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,48 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test that permissions work for file:// URIs (aka local files).
+
+function getPrincipalFromURIString(uriStr)
+{
+  return Services.scriptSecurityManager.getNoAppCodebasePrincipal(NetUtil.newURI(uriStr));
+}
+
+function run_test() {
+  let pm = Services.perms;
+
+  // If we add a permission to a file:// URI, the test should return true.
+  let principal = getPrincipalFromURIString("file:///foo/bar");
+  pm.addFromPrincipal(principal, "test/local-files", pm.ALLOW_ACTION, 0, 0);
+  do_check_eq(pm.testPermissionFromPrincipal(principal, "test/local-files"), pm.ALLOW_ACTION);
+
+  // Another file:// URI should have the same permission.
+  let witnessPrincipal = getPrincipalFromURIString("file:///bar/foo");
+  do_check_eq(pm.testPermissionFromPrincipal(witnessPrincipal, "test/local-files"), pm.UNKNOWN_ACTION);
+
+  // Giving "file:///" a permission shouldn't give it to all file:// URIs.
+  let rootPrincipal = getPrincipalFromURIString("file:///");
+  pm.addFromPrincipal(rootPrincipal, "test/local-files", pm.ALLOW_ACTION, 0, 0);
+  do_check_eq(pm.testPermissionFromPrincipal(witnessPrincipal, "test/local-files"), pm.UNKNOWN_ACTION);
+
+  // Giving "file://" a permission shouldn't give it to all file:// URIs.
+  let schemeRootPrincipal = getPrincipalFromURIString("file://");
+  pm.addFromPrincipal(schemeRootPrincipal, "test/local-files", pm.ALLOW_ACTION, 0, 0);
+  do_check_eq(pm.testPermissionFromPrincipal(witnessPrincipal, "test/local-files"), pm.UNKNOWN_ACTION);
+
+  // Giving 'node' a permission shouldn't give it to its 'children'.
+  let fileInDirPrincipal = getPrincipalFromURIString("file:///foo/bar/foobar.txt");
+  do_check_eq(pm.testPermissionFromPrincipal(fileInDirPrincipal, "test/local-files"), pm.UNKNOWN_ACTION);
+
+  // Revert "file:///foo/bar" permission and check that it has been correctly taken into account.
+  pm.removeFromPrincipal(principal, "test/local-files");
+  do_check_eq(pm.testPermissionFromPrincipal(principal, "test/local-files"), pm.UNKNOWN_ACTION);
+  do_check_eq(pm.testPermissionFromPrincipal(witnessPrincipal, "test/local-files"), pm.UNKNOWN_ACTION);
+  do_check_eq(pm.testPermissionFromPrincipal(fileInDirPrincipal, "test/local-files"), pm.UNKNOWN_ACTION);
+
+  // Add the magic "<file>" permission and make sure all "file://" now have the permission.
+  pm.addFromPrincipal(getPrincipalFromURIString("http://<file>"), "test/local-files", pm.ALLOW_ACTION, 0, 0);
+  do_check_eq(pm.testPermissionFromPrincipal(principal, "test/local-files"), pm.ALLOW_ACTION);
+  do_check_eq(pm.testPermissionFromPrincipal(witnessPrincipal, "test/local-files"), pm.ALLOW_ACTION);
+  do_check_eq(pm.testPermissionFromPrincipal(fileInDirPrincipal, "test/local-files"), pm.ALLOW_ACTION);
+}
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