Windows scheduled task opens window

I try to create a scheduled task,When a webpage is opened, you need to access the creden。 of an HTTP logon dialog box.I can load web pages in IE, but I don't remember my password for some reason. FirefoxNoRemember my password, but it still requires someone to click confirm machine meeting. In addition, the scheduled task will not even run if Firefox is already running, even if I specify a new window as a command line parameter '. Instead, it causes this message: 'Firefox is run by allready, but there is no response. To open a new window ...').Here is the command I used to load the webpage:

"C: \ Program Files \ Mozilla Firefox \ firefox.exe"-New-window http://example.com/

Ideally, this is what I need:

1. URL loaded into a new browser window
2. Log on to an HTTP user name/Password dialog box