--- a/browser/base/content/test/general/browser_web_channel.js
+++ b/browser/base/content/test/general/browser_web_channel.js
@@ -9,16 +9,18 @@ XPCOMUtils.defineLazyModuleGetter(this, 
   "resource://gre/modules/WebChannel.jsm");
 
 const HTTP_PATH = "http://example.com";
 const HTTP_ENDPOINT = "/browser/browser/base/content/test/general/browser_web_channel.html";
 const HTTP_MISMATCH_PATH = "http://example.org";
 const HTTP_IFRAME_PATH = "http://mochi.test:8888";
 const HTTP_REDIRECTED_IFRAME_PATH = "http://example.org";
 
+requestLongerTimeout(2); // timeouts in debug builds.
+
 // Keep this synced with /mobile/android/tests/browser/robocop/testWebChannel.js
 // as much as possible.  (We only have that since we can't run browser chrome
 // tests on Android.  Yet?)
 var gTests = [
   {
     desc: "WebChannel generic message",
     *run() {
       return new Promise(function(resolve, reject) {