Readable view & Downloads for Kindle notebook (highlights) page

kindle.js

// Visit https://read.amazon.com/notebook
(function(){
    var highlights_markdown = function(){
        var markdown = "";
        for (var i=0; i < highlights.length; i++){
            markdown += "> " + highlights[i] + "\n\n";
            var note = notes[i];
            if (note !== "") {
                markdown += note + "\n\n";
            }
        }
        return markdown;
    };

    var highlights_orgmode = function(){
        var orgmode = "";
        for (var i=0; i < highlights.length; i++){
            orgmode += "#+BEGIN_QUOTE\n";
            orgmode += highlights[i] + "\n";
            orgmode += "#+END_QUOTE\n\n";
            var note = notes[i];
            if (note !== "") {
                orgmode += note + "\n\n";
            }
        }
        return orgmode;
    };

    var add_download_links = function(){
        var parent = $('.kp-notebook-bookcover-container').parent();
        add_download_link(parent, 'markdown');
        add_download_link(parent, 'x-org');
    };

    var add_download_link = function(parent, mimetype){
        var a = $('<a />'),
            blob, url, name;
        if (mimetype == 'markdown') {
            a.text('Download Markdown');
            blob = new Blob([highlights_markdown()], {type : 'text/markdown'});
            name = 'kindle-highlights.md';
        } else if (mimetype == 'x-org'){
            a.text('Download Org-Mode');
            blob = new Blob([highlights_orgmode()], {type : 'text/markdown'});
            name = 'kindle-highlights.org';
        }
        url = window.URL.createObjectURL(blob);
        a.addClass('a-row').appendTo(parent).attr('href', url).attr('download', name);
    };

    var make_readable = function (){
        $('#library').hide();
        $('.kp-notebook-metadata').hide();
        $('h3.kp-notebook-metadata').show().parent().toggleClass('a-span5');
        $('.kp-notebook-bookcover-container').hide();
        $('.a-declarative').hide();
        $('.kp-notebook-row-separator').css('border-bottom',"none");
        $('#annotations').css('float', 'none').css('max-width', '800px').css('margin', 'auto');
        $('.a-scroller').css('overflow', 'inherit');
        $('.a-size-small').hide();
    };

    make_readable();
    var highlights = $('.kp-notebook-row-separator')
        .find('#highlight').map(function(idx, x){return $(x).text();});
    var notes = $('.kp-notebook-row-separator')
        .find('#note').map(function(idx, x){return $(x).text();});
    add_download_links();
})();