Avoid "Cannot read property 'get_Current' of undefined" issues.

test/browser/agent_ticket_actions_level3_test.rb

@@ -106,7 +106,7 @@ class AgentTicketActionsLevel3Test < TestCase
       css: '.active div.ticket-article',
       value: 'some level 3 <b>body</b> in instance 2',
     )
-
+    sleep 1
     match_not(
       browser: browser1,
       css: '.content.active .js-reset',

test/browser_test_helper.rb

@@ -59,8 +59,16 @@ class TestCase < Test::Unit::TestCase
       url: ENV['REMOTE_URL'],
       desired_capabilities: caps,
     )
+
+    # avoid "Cannot read property 'get_Current' of undefined" issues
+    begin
       browser_instance_preferences(local_browser)
-    @browsers[local_browser.hash] = local_browser
+    rescue
+      # just try again
+      sleep 10
+      browser_instance_preferences(local_browser)
+    end
+
     local_browser
   end