Non-standard
 
      This feature is not on a current W3C standards track, but it is supported on the Firefox OS platform. Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps.
The mozbrowserclose event is fired when the content of a browser <iframe> calls the window.close() method.
General info
- Specification
 - Non standard
 - Interface
 CustomEvent- Bubbles
 - Yes
 - Cancelable
 - Yes
 - Target
 <iframe>- Default Action
 - None
 
Properties
| Property | Type | Description | 
|---|---|---|
target Read only  |  
    EventTarget |  
    The browser iframe | 
type Read only  |  
    DOMString |  
    The type of event. | 
bubbles Read only  |  
    boolean |  
    Does the event normally bubble? | 
cancelable Read only  |  
    boolean |  
    Is it possible to cancel the event? | 
Example
var browser = document.querySelector("iframe");
browser.addEventListener("mozbrowserclose", function() {
  console.log("Browser window has been closed; IFrame will be destroyed.");
});
Related Events
mozbrowserasyncscrollmozbrowsercontextmenumozbrowsererrormozbrowsericonchangemozbrowserloadendmozbrowserloadstartmozbrowserlocationchangemozbrowseropenwindowmozbrowsersecuritychangemozbrowsershowmodalpromptmozbrowsertitlechangemozbrowserusernameandpasswordrequired