title: Firefox custom extension installer
body: <p>i am searching for hours now, a way that could allow me to install (optionally) a custom firefox extension along with my software installation package.. i can't find anything useful tho. Tried the registry method, the -install-global-extension method, the "Copy to extensions path" method... but nothing seems to work.</p>
  
  <p>Any ideas on how to let the user chose if he wants to install my extension after my package install is finished?</p>