--- a/toolkit/components/url-classifier/tests/mochitest/test_bug1254766.html
+++ b/toolkit/components/url-classifier/tests/mochitest/test_bug1254766.html
@@ -291,14 +291,15 @@ function runTest() {
 SimpleTest.waitForExplicitFinish();
 
 // 'network.predictor.enabled' is disabled because if other testcase load
 // evil.js, evil.css ...etc resources, it may cause we load them from cache
 // directly and bypass classifier check
 SpecialPowers.pushPrefEnv({"set": [
   ["browser.safebrowsing.malware.enabled", true],
   ["network.predictor.enabled", false],
+  ["urlclassifier.gethash.timeout_ms", 30000],
 ]}, runTest);
 
 </script>
 </pre>
 </body>
 </html>

--- a/toolkit/components/url-classifier/tests/mochitest/test_gethash.html
+++ b/toolkit/components/url-classifier/tests/mochitest/test_gethash.html
@@ -143,14 +143,15 @@ function runTest() {
 SimpleTest.waitForExplicitFinish();
 
 // 'network.predictor.enabled' is disabled because if other testcase load
 // evil.js, evil.css ...etc resources, it may cause we load them from cache
 // directly and bypass classifier check
 SpecialPowers.pushPrefEnv({"set": [
   ["browser.safebrowsing.malware.enabled", true],
   ["network.predictor.enabled", false],
+  ["urlclassifier.gethash.timeout_ms", 30000],
 ]}, runTest);
 
 </script>
 </pre>
 </body>
 </html>