Simple function that uses a lot of memory

I am using local storage because after the click, the page is reloaded, so I can keep track of the last clicked item.

As you can see, I tried to clear the localStorage to reduce the used memory, but it is already 1.000.000K in less than 10 minutes of use.

Is this script updating these variables in different places every time my page is reloaded?
What happens to him using this memory? This is my entire code.

This is an extension I'm building for chrome, it picks an option and clicks a button, the button submits the form, reloads the page, and it runs over and over again.

var last = localStorage.getItem('last');
var current = getNext(last);
var prox = getNext(current);

localStorage.clear();

$('select[name="myselect"] option').each(function(){
    if($(this).val().indexOf(current)>-1){
        $(this).prop('selected', true);
        $('.abc').first().click();
        localStorage.setItem('last',current);
    }
});

function getNext(current){
    var arrIds = ['227','228','229','230','231','232'];
    return arrIds[arrIds.indexOf(current)+1] || '227';
}

      

        
        
        
      

    

Updated code without var declarations, which drastically reduced memory consumption, but memory rises over time (after ten minutes from 160.000K to 240.000K):

$('select[name="myselect"] option').each(function(){
    if($(this).val().indexOf(getNext(localStorage.getItem('last')))>-1){
        $(this).prop('selected', true);
        $('.abc').first().click();
        localStorage.setItem('last',getNext(localStorage.getItem('last')));
    }
});

function getNext(current){
    var arrIds = ['227','228','229','230','231','232'];
    return arrIds[arrIds.indexOf(current)+1] || '227';
}