diff --git a/dom/security/test/general/mochitest.ini b/dom/security/test/general/mochitest.ini
index 4ac3ce750dc6..97b0847f939b 100644
--- a/dom/security/test/general/mochitest.ini
+++ b/dom/security/test/general/mochitest.ini
@@ -47,6 +47,7 @@ skip-if = toolkit == 'android'
 [test_same_site_cookies_toplevel_nav.html]
 skip-if = fission # Crashes: @ mozilla::dom::ContentParent::CommonCreateWindow(mozilla::dom::PBrowserParent*, bool, unsigned int const&, bool const&, bool const&, bool const&, nsIURI*, nsTString<char> const&, float const&, unsigned long, nsTString<char16_t> const&, nsresult&, nsCOMPtr<nsIRemoteTab>&, bool*, int&, nsIPrincipal*, nsIReferrerInfo*, bool, nsIContentSecurityPolicy*)
 [test_same_site_cookies_cross_origin_context.html]
+fail-if = fission
 [test_same_site_cookies_from_script.html]
 [test_same_site_cookies_redirect.html]
 [test_same_site_cookies_toplevel_set_cookie.html]
diff --git a/dom/tests/mochitest/localstorage/mochitest.ini b/dom/tests/mochitest/localstorage/mochitest.ini
index 75684eff0d73..1a5ea9589926 100644
--- a/dom/tests/mochitest/localstorage/mochitest.ini
+++ b/dom/tests/mochitest/localstorage/mochitest.ini
@@ -27,6 +27,7 @@ skip-if = os == "android" || verify # bug 962029
 [test_cookieBlock.html]
 [test_embededNulls.html]
 [test_keySync.html]
+fail-if = fission
 [test_localStorageBase.html]
 skip-if = e10s
 [test_localStorageBaseSessionOnly.html]
@@ -34,12 +35,17 @@ skip-if = e10s
 [test_localStorageEnablePref.html]
 [test_localStorageKeyOrder.html]
 [test_localStorageOriginsDiff.html]
+fail-if = fission
 [test_localStorageOriginsDomainDiffs.html]
+fail-if = fission
 [test_localStorageOriginsEquals.html]
 skip-if = toolkit == 'android'
+fail-if = fission
 [test_localStorageOriginsPortDiffs.html]
+fail-if = fission
 [test_localStorageOriginsSchemaDiffs.html]
 skip-if = toolkit == 'android' #TIMED_OUT
+fail-if = fission
 [test_localStorageQuota.html]
 skip-if = toolkit == 'android' #TIMED_OUT
 [test_localStorageQuotaSessionOnly.html]