Fix firefox display bug and selenium tests

src/static/riot/competitions/detail/submission_manager.tag

@@ -400,7 +400,11 @@
         }
 
         self.submission_checked = function () {
-            event.stopPropagation()
+            if (typeof(event) === "object" ){
+                // We can't stop upon page load as there is no "event" (button click).
+                // We can when we we check the checkboxes as that is an "event". 
+                event.stopPropagation() 
+            }
             let inputs = $(self.refs.submission_table).find('input')
             let checked_boxes = inputs.not(':first').filter('input:checked')
             let unchecked_boxes = inputs.not(':first').filter('input:not(:checked)')

src/tests/functional/test_competitions.py

@@ -95,6 +95,7 @@ def test_manual_competition_creation(self):
         self.find('i[class="add icon"]').click()
         self.find('input[selenium="title"]').send_keys('Title')
         self.execute_script('$("textarea[ref=\'content\']")[0].EASY_MDE.value("Testing123")')
+        sleep(1)
         self.find('div[selenium="save1"]').click()
         sleep(1)