Replace the icon image of Hatena blog with another image.

change_default_icon.js

var icon = 'https://path-to-icon';
var hatenaid = 'michimani';
var toc = 200;
var tos = 900;
var p = document.getElementsByClassName('profile-icon');
for (var n = 0; n < p.length; n++){
    p[n].src = icon;
}
window.onload = function(){
    setTimeout(function(){
        var c = document.getElementsByClassName('hatena-id-icon');
        for (var n = 0; n < c.length; n++){
            if (c[n].src.indexOf('/'+hatenaid+'/') >= 0){
                c[n].src = icon;
            }
        }
    }, toc);
    setTimeout(function(){
        var s = document.getElementsByClassName('hatena-star-user');
        for (var n = 0; n < s.length; n++){
            if (s[n].src.indexOf('/'+hatenaid+'/') >= 0){
                s[n].src = icon;
            }
        }
    }, tos);
};