Issue #2808789 by hanoii, nod_, heddn, geerlingguy, lokapujya,...

Issue #2808789 by hanoii, nod_, heddn, geerlingguy, lokapujya, David_Rothstein, mangy.fox, xurizaemon, timfernihough, jibran, effulgentsia, j0rd, joelpittet, temkin, slashrsm, maxi Todorov, leewillis77, droplet, showrx, orbiteleven, opdavies, rooby, yechuah, shabana.navas, nikunjkotecha, ehj-52n, jhedstrom, sah62, edutrul, rfay, seutje, drupalshrek: Drupal alerts "An AJAX HTTP request terminated abnormally" during normal site operation, confusing site visitors/editors