popup.js

var option = document.getElementById('color').value;
                console.log("some event "+event.button)
                chrome.storage.sync.set({
                  favoriteMouseWheelOption: option
                }, function() {
                  // Update status to let user know options were saved.
                  var status = document.getElementById('status');
                  status.textContent = 'Options saved.';
                  setTimeout(function() {
                    status.textContent = '';
                  }, 750);
                });
              }