It has come to my attention that due to the out of process plugin feature in some versions of Firefox, the extension may not block the Open/Save/Print dialogs that are created from the Flash plugin in Windows. The solution to this for now is to disable the ipc settings for the plugins that support it. I will try to create a solution for this soon.
If one wants to look at how the dialogs are patched the source to the xpcom component is in a folder called "source."
When installed the add-on modifies the following default settings to the indicated values.
dom.disable_window_move_resize = true
dom.disable_window_status_change = true
dom.event.contextmenu.enabled = false
browser.fullscreen.autohide = false
browser.download.useDownloadDir = false
browser.urlbar.autocomplete.enabled = false
browser.privatebrowsing.autostart = true
signon.rememberSignons = false
browser.link.open_newwindow.restriction = 0
browser.link.open_newwindow = 3