javascript - Allow content documents (web pages) to detect my Firefox addon -

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in firefox addon i'm looking secure way let content code detect presence of addon itself. ideally i'd end allowing content code query presence of addon executing:

if (window.navigator.my_addon) {   // addon present } else {   // addon not present }

any suggestion/pointers?

adapted here (but using getter make my_addon value read-only)

// contentwindow window object of contentdocument being displayed var s = new components.utils.sandbox(contentwindow); s.window = contentwindow; components.utils.evalinsandbox("   window.wrappedjsobject.navigator.__definegetter__('my_addon', function(){      return true; // or whatever want value                  // (note: unprivileged code!)   });",    s );

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