---
title: Firefox 34 für Entwickler
slug: Mozilla/Firefox/Releases/34
tags:
  - Firefox
  - Releases
translation_of: Mozilla/Firefox/Releases/34
---
<div>{{FirefoxSidebar}}</div><p>Möchtest du helfen Firefox 34 zu dokumentieren? Schaue dir die <a href="http://beta.elchi3.de/doctracker/#list=fx&amp;version=34.0">Liste der Bugs an, über die noch geschrieben werden muss</a>.</p>

<h2 id="Änderungen_für_Webentwickler">Änderungen für Webentwickler</h2>

<h3 id="Entwickler_Werkzeuge">Entwickler Werkzeuge</h3>

<p>Höhepunkte:</p>

<ul>
 <li><a href="https://developer.mozilla.org/en-US/docs/Tools/Storage_Inspector">Storage Inspector: a new tool enabling you to view data stored by web pages</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Tools/Performance">Performance tool: revamped Profiler UI and frame rate timeline</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/tools/Working_with_iframes">Frame switching: point the developer tools at a specific iframe in the page</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/API/Console.table">console.table support</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Tools/Page_Inspector#Examining_event_listeners">jQuery events are visible in the Page Inspector</a></li>
</ul>

<p><a class="external-icon external" href="https://bugzilla.mozilla.org/buglist.cgi?resolution=FIXED&amp;chfieldto=2014-09-02&amp;chfield=resolution&amp;query_format=advanced&amp;chfieldfrom=2014-07-21&amp;chfieldvalue=FIXED&amp;component=Developer%20Tools&amp;component=Developer%20Tools%3A%203D%20View&amp;component=Developer%20Tools%3A%20Canvas%20Debugger&amp;component=Developer%20Tools%3A%20Console&amp;component=Developer%20Tools%3A%20Debugger&amp;component=Developer%20Tools%3A%20Framework&amp;component=Developer%20Tools%3A%20Graphic%20Commandline%20and%20Toolbar&amp;component=Developer%20Tools%3A%20Inspector&amp;component=Developer%20Tools%3A%20Memory&amp;component=Developer%20Tools%3A%20Netmonitor&amp;component=Developer%20Tools%3A%20Object%20Inspector&amp;component=Developer%20Tools%3A%20Profiler&amp;component=Developer%20Tools%3A%20Responsive%20Mode&amp;component=Developer%20Tools%3A%20Scratchpad&amp;component=Developer%20Tools%3A%20Source%20Editor&amp;component=Developer%20Tools%3A%20Storage%20Inspector&amp;component=Developer%20Tools%3A%20Style%20Editor&amp;component=Developer%20Tools%3A%20Timeline&amp;component=Developer%20Tools%3A%20User%20Stories&amp;component=Developer%20Tools%3A%20Web%20Audio%20Editor&amp;component=Developer%20Tools%3A%20WebGL%20Shader%20Editor&amp;component=Developer%20Tools%3A%20WebIDE&amp;component=Simulator&amp;product=Firefox&amp;product=Firefox%20OS&amp;list_id=11184176">All devtools bugs fixed between Firefox 33 and Firefox 34</a>.</p>

<h3 id="CSS">CSS</h3>

<ul>
 <li>Unsere experimentelle Implementierung der CSS Schriftarten Level 3 schreitet voran. Neu implementierte Funktionen sind:
  <ul>
   <li>Der Fallback Algorithmus von {{cssxref("font-variant-position")}}, erstellt synthetische Alternativen für fehlende Glyphen, basierend auf den subscript and superscript metrics supplied by the font ({{bug(1024804)}}).</li>
   <li>Das <code>layout.css.font-features.enabled</code> wurde entfernt, was beudeutet, dass die folgenden Eigenschaften standartmäßig aktiviert sind :
    <ul>
     <li>The CSS Font Level 3 version of {{cssxref("font-variant")}} which is now a shorthand property.</li>
     <li>The longhand properties {{cssxref("font-variant-caps")}}, {{cssxref("font-variant-numeric")}}, {{cssxref("font-variant-position")}}, {{cssxref("font-variant-east-asian")}}, {{cssxref("font-variant-ligatures")}}, and {{cssxref("font-variant-alternates")}}.</li>
     <li>The properties {{cssxref("font-kerning")}} and {{cssxref("font-synthesis")}}</li>
     <li>The properties {{cssxref("font-feature-settings")}} and {{cssxref("font-language-override")}} are unprefixed. The prefixed version are still available for some time to ease transition.</li>
    </ul>
   </li>
  </ul>
 </li>
 <li>To reflect the latest specification changes, the value <code>auto</code> has been renamed in <code>main-size</code> on the {{cssxref("flex-basis")}} property. The shorthand {{cssxref("flex")}} keep an <code>auto</code> value, but it is a synonym of <code>1 1 main-size</code> ({{bug(1032922)}}). The value used for the longhand {{cssxref("flex-basis")}} when omitted in the shorthand is now  <code>0%</code>, and the one for {{cssxref("flex-growth")}} is now <code>1</code>, both different than their initial value.</li>
 <li>The value <code>auto</code> has been added to {{cssxref("min-width")}} and {{cssxref("min-height")}} with a different behavior than the last time ({{bug(984711)}} and {{bug(1015474)}}).</li>
 <li>An experimental implementation, disabled by default, of the filter functional values of the {{cssxref("filter")}} property have been implemented. It is controlled by the <code>layout.css.filters.enabled</code> pref. ({{bug(948265)}})</li>
</ul>

<h3 id="HTML">HTML</h3>

<p><em>Keine Veränderungen.</em></p>

<h3 id="JavaScript">JavaScript</h3>

<ul>
 <li>The ES6 syntax for <a href="/en-US/docs/Web/JavaScript/Reference/Operators/Object_initializer#Computed_property_names">computed property names on object literals</a> has been implemented ({{bug(924688)}}).

  <ul>
   <li>This includes <a href="/en-US/docs/Web/JavaScript/Reference/Functions/get">getter</a> and <a href="/en-US/docs/Web/JavaScript/Reference/Functions/set">setter</a> method names as well ({{bug(1048384)}}) and can also be used with <a href="/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment#Computed_object_property_names_and_destructuring">destructuring</a>.</li>
  </ul>
 </li>
 <li>The ES6<a href="/en-US/docs/Web/JavaScript/Reference/Functions/Method_definitions"> shorthand syntax for defining methods</a> on objects has been implemented ({{bug(924672)}}).</li>
 <li>The ES6 <code>Object</code> method {{jsxref("Object.assign", "Object.assign()")}} has been implemented ({{bug(937855)}}).</li>
 <li>ES6 <a href="/en-US/docs/Web/JavaScript/Reference/template_strings">template strings</a> and the {{jsxref("String.raw()")}} method are now supported ({{bug(1038259)}}, {{bug(1039774)}}).</li>
 <li>A new ES6 object {{jsxref("WeakSet")}} has been added ({{bug(792439)}}).</li>
 <li>ES6 <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol">Symbols</a> (only available in the Nightly channel) have been updated to conform with recent specification changes ({{bug(1042602)}}):
  <ul>
   <li>When trying to convert a symbol to a number, a <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypeError" title="The TypeError object represents an error when a value is not of the expected type."><code>TypeError</code></a> will be thrown now.</li>
   <li>When using loose equality, <code>Object(sym) == sym</code> returns <code>true</code> now.</li>
  </ul>
 </li>
 <li>The experimental {{jsxref("TypedArray.prototype.move()")}} method (only available in former Nightly and Aurora channels) has been replaced with the now implemented standard ES6 {{jsxref("TypedArray.prototype.copyWithin()")}} method ({{bug(1021379)}}).</li>
 <li>In <a href="/en-US/docs/Web/JavaScript/Reference/Strict_mode">strict mode</a>, setting a <a href="/en-US/docs/Web/JavaScript/Reference/Operators/Object_initializer#Duplicate_property_names">duplicate property name in object literals</a> will no longer throw a <code>SyntaxError</code> as per ES6 specification ({{bug(1041128)}}).</li>
</ul>

<h3 id="InterfacesAPIsDOM">Interfaces/APIs/DOM</h3>

<ul>
 <li>The {{domxref("Element.matches()")}} method has been added; it does what the non-standard <code>mozMatchesSelector()</code> was doing ({{bug(886308)}}).</li>
 <li>The {{domxref("URLUtils.searchParams", "searchParams")}} property has been added to the {{domxref("Location")}} interface, available via the {{domxref("document.location")}} and {{domxref("window.location")}} properties ({{bug(1037715)}}).</li>
 <li>The {{domxref("Performance.now()")}} method is now available to Web workers ({{bug(908390)}}).</li>
 <li>The non-standard interface <code>MozNamedAttrMap</code> has been renamed to the standard {{domxref("NamedNodeMap")}} and {{domxref("Element.attributes")}} has been adapted to use it ({{bug(1055467)}}).</li>
 <li>The non-standard methods and properties of {{domxref("Window.crypto")}} have been removed ({{bug(1030963)}}). Only methods and properties defined in the standard WebCrypto API are left.</li>
</ul>

<h3 id="MathML">MathML</h3>

<p><em>Keine Veränderungen.</em></p>

<h3 id="SVG">SVG</h3>

<p><em>Keine Veränderungen.</em></p>

<h3 id="AudioVideo">Audio/Video</h3>

<p><em>Keine Veränderungen</em><em>.</em></p>

<h2 id="Sicherheit">Sicherheit</h2>

<p><em>Keine Veränderungen</em><em>.</em></p>

<h2 id="Änderungen_für_Add-on_und_Mozilla_Entwickler">Änderungen für Add-on und Mozilla Entwickler</h2>

<p><em>Keine Veränderungen</em><em>.</em></p>

<h2 id="Ältere_Versionen">Ältere Versionen</h2>

<p>{{Firefox_for_developers('33')}}</p>