Disable popup that reads ""Save this record?

FWIW, there are a couple of other things you can do:

(1) Simply noop QuickBase's ConfirmLinkAway function by redefining it with no body: 

function ConfirmLinkAway(){} 

(2) Define a Mutation Observer so that when the dialog appears your code immediately clicks on the Save button. 

$(function(){
  var observer = new MutationObserver(function(mutations) {
    
    mutations.forEach(function(mutation) {
      if (mutation.type == "childList" && mutation.target.getAttribute("id") == "dialogLinkAway") {
        $("#dialogLinkAway button:contains(Save)").click();
      }
    });
  });
  var body = document.body;
  
  var config = {
    childList: true,
    subtree: true
  };
  observer.observe(body, config);
});

I didn't test this code but it should work. See this example of a Mutation Observer that focused on the Save button when a certain Form Rule Dialog Box appeared:

Form Rule Message Box - Dismiss With Enter Rather Than Click
https://haversineconsulting.quickbase.com/db/bgcwm2m4g?a=dr&rid=274