title: How do I write Firefox add-on that automatically enters proxy passwords?
body: <p>Suppose someone worked for a company that put up an HTTP proxy preventing internet access without password authentication (NTLM, I think). Also suppose that this password rotated on a daily basis, which added very little security, but mostly served to annoy the employees. How would one get started writing a Firefox add-on that automatically entered these rotating passwords?</p>
  
  <p><em>To clarify: This add-on would not just submit the password; the add-on would programmatically generate it with some knowledge of the password rotation scheme.</em></p>