javascript - Save web pages with Firefox addon using file -> save as pop-up window -

let me start off saying new add-on development. using add-on sdk, trying create simple firefox add-on that, when button pressed, acts pressing ctrl-s hotkey, or following file -> save page save page pop window. have looked @ similar questions on here, seem going around built in save functions, , not utilizing "save page as" window.

the end goal run other functions before save call made. user see save page window normal.

i unaware of ways send hotkey signals, or accessing file drop down menu within add-on.

one way invoke save as dialog if user had clicked on "save page as..." menu item (id="menu_savepage"). can executing docommand() method of menu item. following assumes event passed in command event button user clicked.

function launchsaveasfrombutton(event) {      var window = event.view;      //create common variables if not exist.     //  should work firefox context.     //  depending on context in function being run,     //  simplified.     if (window === null || typeof window !== "object") {         //if not have window reference, need obtain one:         //  add "/" un-comment code appropriate add-on type.         //* add-on sdk:         var window = require('sdk/window/utils').getmostrecentbrowserwindow();         //*/         /* overlay , bootstrap (from context/scope):         var window=components.classes["@mozilla.org/appshell/window-mediator;1"]                              .getservice(components.interfaces.nsiwindowmediator)                              .getmostrecentwindow("navigator:browser");         //*/     }     if (typeof document === "undefined") {         //if there no document defined,         var document = window.content.document;     }     if (typeof gbrowser === "undefined") {         //if there no gbrowser defined,         var gbrowser = window.gbrowser;     }      let menusavepage = gbrowser.ownerdocument.getelementbyid("menu_savepage");     menusavepage.docommand(); } 

finding out id "save page as..." dialog made easier using dom inspector in combination add-on element inspector.