I'm running into a strange problem with my Firebase project when I try to use Password authentication. It works most of the time in Chrome (occasionally will result in this error), but when I run my app on an emulator or phone (Android), (at least) the first login attempt per load always results in an "Auth/network-request-failed" error. Here is my relevant Firebase code:

<script src="https://www.gstatic.com/firebasejs/3.2.1/firebase.js"></script>

. . .

$(document).on('click', '#loginButton', function() {
          var email = document.getElementById("loginEmail").value;
          var password = document.getElementById("loginPassword").value;
          firebase.auth().signInWithEmailAndPassword(email, password).then(function() {
            user = firebase.auth().currentUser;
            //Load in the user's pets and then switch to the "My Pets" page.
            $.getJSON('https://petspot-a43e7.firebaseio.com/users/'   user.uid   '/pets.json', function(data) {
              pets = {};
              for (var key in data) {
                pets[key] = JSON.parse(data[key]);
              }
            }).then(function() {
              $("#header").removeClass("invisible");
              Materialize.toast('Logged in successfully!', 2000, 'bottom');
              changePage("page1");
            });
            //Load the user's username and modify the sidebar accordingly.
            $.getJSON('https://petspot-a43e7.firebaseio.com/users/'   user.uid   '/username.json', function(data) {
              $("#sidebarName").html(data);
              $("#sidebarEmail").html(user.email);

            });
          }).catch(function(error) {
            // Handle Errors here.
            var errorCode = error.code;
            console.log(errorCode);
            var errorMessage = error.message;
            if (errorCode == "auth/user-disabled") {
              $('#'   "user-disabled").openModal();
            } else if (errorCode == "auth/user-not-found") {
              $('#'   "user-not-found").openModal();
            } else if (errorCode == "auth/too-many-requests") {
              $('#'   "too-many-requests").openModal();
            } else if (errorCode == "auth/wrong-password") {
              $('#'   "wrong-password").openModal();
            } else {
              alert(errorCode);
              alert(errorMessage);
            }
          });   

Any help would be greatly appreciated. Thank you all so much!