check.js

var a = document.getElementsByTagName('a');
for (i=0;i<a.length;i++) {
    p = /imgur\.com\/([A-Za-z0-9]+\.+[A-Za-z0-9]+)/;
    res = p.exec(a[i]);
    if (res!=null) {
        a[i].href = 'https://img.readitlater.com/i/imgur.com/' + res[1];
    }
    else {
      var res = a[i].href.split("imgur.com/");
      if(res != null)
        a[i].href = 'https://img.readitlater.com/i/imgur.com/' + res[1] +'.jpg';
    }
}