Hi all,

I searched the forums and was not able to come up with an answer to my post. I hope someone can help.

When IE8 launched inPrivateBrowsing, they made code available to detect its use:

Code:
if (navigator.userAgent.indexOf("MSIE")>-1) {
     if (window != 0) {
          if (typeof window.external != "undefined") {
               try {
                    if (window.external.InPrivateFilteringEnabled() == true) {
                         var isMSIEinPrivate=true;
                    }
               } catch(e){
               }
          }
     }
}
I need to find a similar piece of code that will detect private browsing mode for Firefox 3.5. I thought I had found a solution on developer.mozilla, but I can't make it work.

Code:
if (navigator.userAgent.indexOf("Firefox")>-1) {
     try {
          var pbs = Components.classes["@mozilla.org/privatebrowsing;1"]
               .getService(Components.interfaces.nsIPrivateBrowsingService);
          var inPrivateBrowsingMode = pbs.privateBrowsingEnabled;

          if (inPrivateBrowsingMode) {
               var isFFXPrivate=true;
          }
     } catch(e){
          alert("Error Trapped!");
     }	
}
This always alerts Error Trapped when I view it in Firefox, even in 3.5 with Private Browsing mode turned on. Is there a solution via javascript to detect this browsing mode in Firefox?

Thank you in advance for your help.

-- Richard