Simple Javascript for JQL History as provided by Rnejith V in https://answers.atlassian.com/questions/138938/what-happened-with-search-history

gistfile1.js

<script type='text/javascript'>
var refreshJqlHistoryPane = function() {
    var localHistory = localStorage.getItem('jqlHistory');
    if(localHistory){
        var history = JSON.parse(localHistory);
        var historyEntries = history.map(function(jql){
            var display = jql;
            if(display.length > 25){
                display = display.substr(0,22) + "...";
            }
            return '<li><a href="'+ AJS.contextPath() + '/issues/?jql=' + encodeURIComponent(jql)  + '">' + display + '</a></li>';
        });
        var historyBlock = '<nav class="aui-navgroup aui-navgroup-vertical"><div id="jql-history-panel"><div class="aui-nav-heading"><strong>JQL History</strong></div>' +
        '<ul class="aui-nav">' +
            historyEntries.join("") + '</ul></div></nav>';
 
        if(AJS.$('#jql-history-panel')){
            AJS.$('#jql-history-panel').remove();
        }
        AJS.$(AJS.$('.filter-panel-section')[0]).after(historyBlock);
    }
}
 
var handleJqlSearch = function(){
    JIRA.bind(JIRA.Events.NEW_CONTENT_ADDED, function(){
        var currJql = AJS.$('#advanced-search').val();
        if(null != currJql && currJql !== "")
        {
            var rawdata = localStorage.getItem('jqlHistory');
            var history;
 
            if(rawdata){
                history = JSON.parse(rawdata);
                var lastJql = history[0];
                if(lastJql != currJql){
                    history.unshift(currJql);
                }
                if(history.length > 10){
                    history.pop();
                }
            }
            else{
                history = new Array();
                history.push(currJql);
            }
            localStorage.setItem('jqlHistory', JSON.stringify(history));
        }
        refreshJqlHistoryPane();
    });
}
 
AJS.$(document).ready(function() {
    if(AJS.$('#advanced-search')) {
        handleJqlSearch();
    }
});
</script>