diff --git a/toolkit/components/extensions/test/mochitest/mochitest-common.ini b/toolkit/components/extensions/test/mochitest/mochitest-common.ini
index bd7fb83139af..2e7cdcdd4952 100644
--- a/toolkit/components/extensions/test/mochitest/mochitest-common.ini
+++ b/toolkit/components/extensions/test/mochitest/mochitest-common.ini
@@ -192,9 +192,10 @@ skip-if = os == 'android'
 [test_ext_webrequest_background_events.html]
 [test_ext_webrequest_basic.html]
 skip-if =
-    os == 'android' && debug  # bug 1397615
-    tsan  # bug 1612707
-    xorigin  # JavaScript Error: "SecurityError: Permission denied to access property "wrappedJSObject" on cross-origin object" {file: "http://mochi.false-test:8888/tests/SimpleTest/TestRunner.js" line: 157}]
+  os == 'android' && debug  # bug 1397615
+  tsan  # bug 1612707
+  xorigin  # JavaScript Error: "SecurityError: Permission denied to access property "wrappedJSObject" on cross-origin object" {file: "http://mochi.false-test:8888/tests/SimpleTest/TestRunner.js" line: 157}]
+  os == "linux" && bits == 64 && !debug && asan # Bug 1633189
 [test_ext_webrequest_errors.html]
 skip-if = tsan
 [test_ext_webrequest_filter.html]