diff --git a/browser/devtools/netmonitor/netmonitor-controller.js b/browser/devtools/netmonitor/netmonitor-controller.js
index 92b11f9a59f6..aaafaf874179 100644
--- a/browser/devtools/netmonitor/netmonitor-controller.js
+++ b/browser/devtools/netmonitor/netmonitor-controller.js
@@ -799,7 +799,12 @@ function whenDataAvailable(aDataStore, aMandatoryFields) {
 };
 
 const WDA_DEFAULT_VERIFY_INTERVAL = 50; // ms
-const WDA_DEFAULT_GIVE_UP_TIMEOUT = 2000; // ms
+
+// Use longer timeout during testing as the tests need this process to succeed
+// and two seconds is quite short on slow debug builds. The timeout here should
+// be at least equal to the general mochitest timeout of 45 seconds so that this
+// never gets hit during testing.
+const WDA_DEFAULT_GIVE_UP_TIMEOUT = gDevTools.testing ? 45000 : 2000; // ms
 
 /**
  * Helper method for debugging.