For #10253: Add disableFirstTimePWAPopup for performance testing (#10442)

app/src/main/java/org/mozilla/fenix/perf/Performance.kt

@@ -30,6 +30,7 @@ object Performance {
 
         disableOnboarding(context)
         disableTrackingProtectionPopups(context)
+        disableFirstTimePWAPopup(context)
     }
 
     /**
@@ -68,4 +69,11 @@ object Performance {
     private fun disableTrackingProtectionPopups(context: Context) {
         Settings.getInstance(context).isOverrideTPPopupsForPerformanceTest = true
     }
+
+    /**
+     * Disables the first time PWA popup.
+     */
+    private fun disableFirstTimePWAPopup(context: Context) {
+        Settings.getInstance(context).shouldShowFirstTimePwaFragment = false
+    }
 }