The issue is marted as fixed, but the fix is not propagated yet

Author: barancev

java/client/test/org/openqa/selenium/AlertsTest.java

@@ -190,9 +190,9 @@ public void testShouldAllowAUserToDismissAPrompt() {
 
   @JavascriptEnabled
   @Test
-  @Ignore(value = MARIONETTE, issue = "https://github.com/mozilla/geckodriver/issues/607")
-  @NotYetImplemented(value = {HTMLUNIT},
-    reason = "HtmlUnit: click()/prompt need to run in different threads")
+  @NotYetImplemented(value = {HTMLUNIT, MARIONETTE},
+    reason = "HtmlUnit: click()/prompt need to run in different threads" +
+             "Marionette: https://github.com/mozilla/geckodriver/issues/607")
   public void testShouldAllowAUserToSetTheValueOfAPrompt() {
     driver.get(promptPage(null));
 
@@ -366,9 +366,9 @@ public void testPromptShouldHaveNullValueIfDismissed() {
 
   @JavascriptEnabled
   @Test
-  @Ignore(value = MARIONETTE, issue = "https://github.com/mozilla/geckodriver/issues/607")
-  @NotYetImplemented(value = HTMLUNIT,
-    reason = "HtmlUnit: click()/prompt need to run in different threads.")
+  @NotYetImplemented(value = {HTMLUNIT, MARIONETTE},
+    reason = "HtmlUnit: click()/prompt need to run in different threads." +
+             "Marionette: https://github.com/mozilla/geckodriver/issues/607")
   public void testHandlesTwoAlertsFromOneInteraction() {
     driver.get(appServer.create(new Page()
         .withScripts(