Spotify Add / Favorite Script - use it in a playlist (like discover weekly) to add all songs to your collection

SpotifyAdd.js

// Just press F12 in Chrome and paste code to console
// only works on pages that use .btn class only
var addButtons = document.querySelectorAll('tr:not(.added) .btn.btn-icon.btn-add:not(.added)');
for (var i=0; i<addButtons.length; i++) {
  addButtons[i].click()
}

// or use this
function favoriteAll() {
    console.log('favoriting all');

    var addButtons = Array.prototype.slice.call(document.querySelectorAll('tr:not(.added) .button-icon-only.button-add:not(.added), tr:not(.added) .btn.btn-icon.btn-add:not(.added)')).filter(function(button) {
        return button.dataset.logClick === 'add-button';
    });

    for (var i=0; i<addButtons.length; i++) {
        addButtons[i].click();
    }
}