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Thread: Application hungs in FireFox version >= 39

    Looks like we can't reproduce the issue or there's a problem in the test case provided.
  1. #1
    Sencha User
    Join Date
    Aug 2010

    Default Application hungs in FireFox version >= 39

    Ext version tested:
    • Ext
    • Ext
    • Ext
    • Ext
    Browser versions tested against:
    • FF39
    • FF40
    • FF41
    DOCTYPE tested against:
    • <!DOCTYPE html>
    ExtJs application hungs up during start up in Firefox versions 39, 40, 41 when doing Ext.Object.freeze(this) in root controller init method.
    When using ExtJs v. application loads just fine.

    Steps to reproduce the problem:
    The result that was expected:
    • Demo application loads
    The result that occurs instead:
    • Browser hungs up

  2. #2
    Sencha Premium User
    Join Date
    Apr 2007
    Sydney, Australia


    I don't really think it's reasonable to expect this to be possible. It would be dictating that Ext written classes wouldn't be able to modify their internal state at any arbitrary point. Imagine:

    Ext.define('Foo', {
        extend: 'Ext.Component',
        initComponent: function() {
    The methods in Ext.Object are typically meant for use with object literals.

    What's likely happening in your example is that freeze is preventing the _init flag from being set on the controller, so it is never able to fully initialize and ends up in a loop trying to do so.

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