Phenomenon of bug 831664 was as follows.

  var Folder=window.GetFirstSelectedMsgFolder();
  var data=Folder.server.isGmailServer; => data is "undefined"
  var t=[];for(var xx in Folder.server){t[t.length]=xx+"="+Folder.server[xx];}
      => isGmailServer is not returned by enumerator
  If Folder.server.isGmailServer=true(or false) is atempted when undefined,
  Exception of this bug occurs because isGmailServer doesn't exist.

  After access of all properties of Folder(owner of Folder.server) by following,
       var u=[];for(var yy in Folder){u[u.length]=yy+"="+Folder[yy];}
  Folder.server.isGmailServer is returned normally, and value change is OK.

  Same phenomenon is also seen on som other properties of the
Folder.server.

Who is wrong? Wrapper? Creator of original object what is accessed by
window.GetFirstSelectedMsgFolder() or
window.GetFirstSelectedMsgFolder().server?

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https://bugs.launchpad.net/bugs/605513

Title:
  Get uncaught exception when populating a form in FireFox 3.6

Status in The Mozilla Firefox Browser:
  Confirmed
Status in “firefox” package in Ubuntu:
  Triaged

Bug description:
  Binary package hint: firefox

  When populating an input field on a form in Firefox (Linux or Windows)
  where I select or just pass the mouse over one of the historical
  suggestions that drops down while inputting, I receive the following
  error: Error: uncaught exception: [Exception... "Cannot modify
  properties of a WrappedNative"  nsresult: "0x80570034
  (NS_ERROR_XPC_CANT_MODIFY_PROP_ON_WN)"  location: "JS frame ::
  chrome://global/content/bindings/autocomplete.xml :: onxblpopuphiding
  :: line 825"  data: no]

  I do not receive the error in Google Chrome

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: firefox 3.6.6+nobinonly-0ubuntu0.10.04.1
  ProcVersionSignature: Ubuntu 2.6.32-23.37-generic 2.6.32.15+drm33.5
  Uname: Linux 2.6.32-23-generic i686
  Architecture: i386
  Date: Wed Jul 14 10:02:01 2010
  FirefoxPackages:
   firefox 3.6.6+nobinonly-0ubuntu0.10.04.1
   firefox-gnome-support 3.6.6+nobinonly-0ubuntu0.10.04.1
   firefox-branding 3.6.6+nobinonly-0ubuntu0.10.04.1
   abroswer N/A
   abrowser-branding N/A
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  ProcEnviron:
   LANG=en_US.utf8
   SHELL=/bin/bash
  SourcePackage: firefox

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