Use mutation observer to detect dynamic element creation

mutation-observer.js

var target = document.querySelector('#bc-sf-filter-products');
var observer = new MutationObserver(function(mutations) {
  mutations.forEach(function(mutation) {
    if (mutation.type === 'childList') {
      // Do some stuff
      productsGrid();
    }
  });
});
var config = { attributes: true, childList: true, characterData: true }

if (target.length) {
  observer.observe(target, config);
}