{panel:bgColor=#e7f4fa}
NOTE: This suggestion is for JIRA Cloud. Using JIRA Server? [See the corresponding suggestion|http://jira.atlassian.com/browse/JRASERVER-43422].
{panel}
Actually the jQuery version used in JIRA is still using the function jQuery.browser which is deprecated and has been removed since jQuery 1.9.
In our plugins, we are using a newer version of jQuery but this causes conflicts between the two different versions breaking the new menu navigation.