notify user if settings are not saved when pop-up is closed

[AnweshGangula]

Right now, if the user make a change in settings and click on the chrome tab without clicking the save button, the settings don't get saved. You can use below code to notify user

Check out this link for reference: https://stackoverflow.com/a/65563521/6908282

// popup.js
chrome.runtime.connect({ name: "popup" });

// background.js
chrome.runtime.onConnect.addListener(function(port) {
    if (port.name === "popup") {
        port.onDisconnect.addListener(function() {
           console.log("popup has been closed")
        });
    }
});