diff --git a/mailnews/compose/test/unit/xpcshell.ini b/mailnews/compose/test/unit/xpcshell.ini
index d9714c9c35..56fc293bea 100644
--- a/mailnews/compose/test/unit/xpcshell.ini
+++ b/mailnews/compose/test/unit/xpcshell.ini
@@ -11,9 +11,11 @@ skip-if = os == 'mac'
 [test_bug235432.js]
 [test_bug474774.js]
 [test_detectAttachmentCharset.js]
+skip-if = true # See bug 1602816.
 [test_expandMailingLists.js]
 [test_mailtoURL.js]
 [test_messageHeaders.js]
+skip-if = true # See bug 1602816.
 [test_nsIMsgCompFields.js]
 [test_nsMsgCompose1.js]
 [test_nsMsgCompose2.js]
diff --git a/mailnews/import/test/unit/xpcshell.ini b/mailnews/import/test/unit/xpcshell.ini
index d0823a2b46..a30450dce0 100644
--- a/mailnews/import/test/unit/xpcshell.ini
+++ b/mailnews/import/test/unit/xpcshell.ini
@@ -16,6 +16,7 @@ run-if = os == 'win'
 [test_outlook_settings.js]
 run-if = os == 'win'
 [test_shiftjis_csv.js]
+skip-if = true # See bug 1602816.
 [test_utf16_csv.js]
 [test_vcard_import.js]
 [test_winmail.js]