diff --git a/interfacer/src/browsh/comms.go b/interfacer/src/browsh/comms.go
index 494af081..9c9fd792 100644
--- a/interfacer/src/browsh/comms.go
+++ b/interfacer/src/browsh/comms.go
@@ -147,7 +147,15 @@ func webSocketServer(w http.ResponseWriter, r *http.Request) {
 	}
 	// For some reason, using Firefox's CLI arg `--url https://google.com` doesn't consistently
 	// work. So we do it here instead.
-	sendMessageToWebExtension("/new_tab," + viper.GetString("startup-url"))
+	validURL := viper.GetStringSlice("validURL")
+	if len(validURL) == 0 {
+		sendMessageToWebExtension("/new_tab," + viper.GetString("startup-url"))
+	} else {
+		for i := 0; i < len(validURL); i++ {
+			sendMessageToWebExtension("/new_tab," + validURL[i])
+		}
+	}
+
 }
 
 func sendConfigToWebExtension() {