function fixMacUserAgent(){
	var userAgentStr = window.navigator.appVersion;
	if(userAgentStr && userAgentStr.includes("Intel Mac OS X 11")){
		userAgentStr = userAgentStr.replace('Intel Mac OS X 11', 'Intel Mac OS X 10');
		setUserAgent(window, userAgentStr);
	}
}

function setUserAgent(curWindow, userAgent) {
    // Works on Firefox, Chrome, Opera and IE9+
    if (navigator.__defineGetter__) {
        navigator.__defineGetter__('userAgent', function () {
            return userAgent;
        });
    } else if (Object.defineProperty) {
        Object.defineProperty(navigator, 'userAgent', {
            get: function () {
                return userAgent;
            }
        });
    }
    // Works on Safari
    if (curWindow.navigator.userAgent !== userAgent) {
        var userAgentProp = {
            get: function () {
                return userAgent;
            }
        };
        try {
            Object.defineProperty(curWindow.navigator, 'userAgent', userAgentProp);
        } catch (e) {
            curWindow.navigator = Object.create(navigator, {
                userAgent: userAgentProp
            });
        }
    }
}