---
title: Firefox 68 für Entwickler
slug: Mozilla/Firefox/Releases/68
translation_of: Mozilla/Firefox/Releases/68
---
<p>{{FirefoxSidebar}}{{Draft}}</p>

<p class="summary">This article provides information about the changes in Firefox 68 that will affect developers. Firefox 68 is the current <a href="https://www.mozilla.org/en-US/firefox/channel/desktop/#beta" rel="noopener">Beta version of Firefox</a>, and will ship on <a href="https://wiki.mozilla.org/RapidRelease/Calendar#Future_branch_dates" rel="noopener">July 9, 2019</a>.</p>

<h2 id="Changes_for_web_developers">Changes for web developers</h2>

<h3 id="Developer_tools">Developer tools</h3>

<ul>
 <li>Die Einstellung, die die Sichtbarkeit interner Erweiterungen (System-Add-Ons und versteckte Erweiterungen) auf der <a href="/en-US/docs/Tools/about:debugging">about:debugging</a>-Seite kontrolliert, wurde von <code>devtools.aboutdebugging.showSystemAddons</code> zu  <code>devtools.aboutdebugging.showHiddenAddons</code> geändert ({{bug(1544372)}}).</li>
 <li>Die Konsole zeigt jetzt <a href="/en-US/docs/Tools/Web_Console/Console_messages#CSS">mehr Informationen über CSS-Warnungen</a> inklusive einer Liste der Knoten der DOM-Elemente, die die Regel genutzt haben ({{bug(1093953)}}).</li>
 <li>Über die <a href="/en-US/docs/Tools/Network_Monitor/request_list#Filtering_requests">Anfragen-Liste</a> der Netzwerkanalyse kann jetzt eine spezifische URL geblockt werden ({{bug(1151368)}}).</li>
 <li>Es ist jetzt möglich, eine Netzwerkanfrage erneut zu senden, ohne das Verfahren, die URL, die Parameter oder die Überschrift ändern zu müssen, indem der <a href="/en-US/docs/Tools/Network_Monitor/request_list#Context_menu">Resend</a>-Befehl im Kontextmenü ausgeführt wird ({{bug(1422014)}}).</li>
 <li>Es ist jetzt möglich, die <a href="/en-US/docs/Tools/Network_Monitor/request_list#Network_request_columns">Breite der Spalten</a> in der Netzwerkanalyse zu ändern, um dem Arbeitsalauf gerecht zu werden. ({{bug(1358414)}}).</li>
 <li>The context menu of the <a href="/en-US/docs/Tools/Network_Monitor/request_details#Headers">Headers</a> tab now allows you to copy all or some of the header information to the clipboard in JSON format ({{bug(1442249)}}).</li>
 <li>A button has been added to the <a href="/en-US/docs/Tools/Page_Inspector/How_to/Examine_and_edit_CSS#Examine_CSS_rules">rules panel</a> of the Page Inspector that allows you to toggle display of any print media queries ({{bug(1534984)}}).</li>
 <li>An icon will be displayed next to invalid or unsupported <a href="/en-US/docs/Page_Inspector/How_to/Examine_and_edit_CSS#Examine_CSS_rules">CSS rules</a> in the Rules pane of the Page Inspector ({{bug(1306054)}}).</li>
</ul>

<h4 id="Removals">Removals</h4>

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

<p><em>No changes.</em></p>

<h4 id="Removals_2"> Removals</h4>

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

<ul>
 <li><a href="/en-US/docs/Web/CSS/CSS_Scroll_Snap">CSS Scroll Snapping</a> has been updated to the latest version of the specification ({{bug(1312163)}}) and ({{bug(1544136)}}), this includes:

  <ul>
   <li>The scroll-padding properties ({{bug(1373832)}})</li>
   <li>The scroll-margin properties ({{bug(1373833)}})</li>
   <li>{{CSSxRef("scroll-snap-align")}} ({{bug(1373835)}})</li>
  </ul>
 </li>
 <li>The {{CSSxRef("-webkit-line-clamp")}} property has been implemented for compatibility with other browsers ({{bug(866102)}}).</li>
 <li>Support {{CSSxRef("::marker")}} pseudo-element ({{bug(205202)}}) and animation for ::marker pseudos ({{bug(1538618)}})</li>
 <li>Change {{CSSxRef("currentColor")}} to be a computed value (except for color property)  ({{bug(760345)}}).</li>
 <li>Fix support for the 'ch' length unit to match spec (fallback for no '0' glyph, vertical metrics) ({{bug(282126)}})</li>
 <li>The  {{CSSxRef("counter-set")}} property has been implemented. ({{bug(1518201)}})</li>
 <li>Implement list numbering using a built-in 'list-item' counter - fixes list numbering bugs ({{bug(288704)}})</li>
 <li>CSS Transforms are now supported in indirectly rendered things e.g.)  {{SVGElement("mask")}},  {{SVGElement("marker")}},  {{SVGElement("pattern")}},  {{SVGElement("clipPath")}} ({{bug(1323962)}}).</li>
</ul>

<h4 id="Removals_3">Removals</h4>

<ul>
 <li>{{CSSxRef("scroll-snap-coordinate")}}, {{CSSxRef("scroll-snap-destination")}}, {{CSSxRef("scroll-snap-type-x")}} and {{CSSxRef("scroll-snap-type-y")}} have been removed.</li>
 <li>The {{CSSxRef("scroll-snap-type")}} property has become a longhand, so the old shorthand syntax like <code>scroll-snap-type:mandatory</code> will stop working. See the <a href="https://www.fxsitecompat.com/en-CA/docs/2019/legacy-css-scroll-snap-syntax-support-has-been-dropped/">Firefox Site Compatability</a> note.</li>
</ul>

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

<p><em>No changes.</em></p>

<h4 id="Removals_4">Removals</h4>

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

<p><em>No changes.</em></p>

<h4 id="Removals_5">Removals</h4>

<h3 id="APIs">APIs</h3>

<p><em>No changes.</em></p>

<h4 id="New_APIs">New APIs</h4>

<ul>
 <li>Implement Resize Observer API ({{bug(1272409)}}).</li>
</ul>

<h4 id="DOM">DOM</h4>

<ul>
 <li>The <a href="/en-US/docs/Web/API/Visual_Viewport_API">Visual Viewport API</a> has now been enabled by default on Android ({{bug(1512813)}}). Adding this API to desktop versions of Firefox is being tracked in {{bug(1551302)}}.</li>
 <li>The {{domxref("HTMLImageElement.decode", "decode()")}} element on images is now implemented. this can be used to trigger loading and decoding of an image prior to adding it to the DOM ({{bug(1501794)}}).</li>
 <li>The <a href="/en-US/docs/Web/API/Notifications_API">Notifications API</a> now requires that the user interact with the page before it can request permission to send notifications ({{bug(1524619)}}).</li>
 <li>{{domxref("XMLHttpRequest")}} has been updated to no longer accept the non-standard <code>moz-chunked-arraybuffer</code> value for {{domxref("XMLHttpRequest.responseType", "responseType")}}. Code still using it should be updated to <a href="/en-US/docs/Web/API/Streams_API/Using_readable_streams#Consuming_a_fetch_as_a_stream">use the Fetch API as a stream</a> ({{bug(1120171)}}).</li>
 <li><code>XMLHttpRequest</code> now outputs a warning to console if you perform a synchronous request while handling an {{domxref("Window.unload_event", "unload")}}, {{domxref("Window.beforeunload_event", "beforeunload")}}, or {{domxref("Window.pagehide_event", "pagehide")}} event ({{bug(980902)}}).</li>
 <li>The {{domxref("Document.cookie", "cookie")}} property has moved from the {{domxref("HTMLDocument")}} interface to the {{domxref("Document")}} interface, allowing documents other than {{Glossary("HTML")}} to use cookies ({{bug(144795)}}).</li>
</ul>

<h4 id="DOM_events">DOM events</h4>

<h4 id="Service_workers">Service workers</h4>

<h4 id="Media_Web_Audio_and_WebRTC">Media, Web Audio, and WebRTC</h4>

<ul>
 <li>WebRTC has been updated to recognize that a <code>null</code> candidate passed into the {{domxref("RTCPeerConnection.icecandidate", "icecandidate")}} event handler, indicating the receipt of a candidate, instead indicates that there are no further candidates coming; when this happens the ICE gathering ({{domxref("RTCPeerConnection.iceGatheringState", "iceGatheringState")}}) state reaches <code>complete</code> ({{bug(1318167)}}).</li>
 <li>The {{domxref("RTCRtpReceiver")}} methods {{domxref("RTCRtpReceiver.getContributingSources", "getContributingSources()")}} and {{domxref("RTCRtpReceiver.getSynchronizationSources", "getSynchronizationSources()")}} now support video tracks; previously they only worked on audio ({{bug(1534466)}}).</li>
 <li>
  <p>{{domxref("MediaDevices.getUserMedia", "getUserMedia()")}} may no longer be used from a non-secure context; attempting to do so now throws a <code>NotAllowedError</code> result. Secure contexts are those loaded using HTTPS, those located using the <code>file:///</code> scheme, and those loaded from <code>localhost</code>. For now, if you must, you can re-enable the ability to perform insecure calls to <code>getUserMedia()</code> by setting the preference <code>media.getusermedia.insecure.enabled</code> to <code>true</code> ({{bug(1335740)}}).</p>

  <div class="blockIndicator note">
  <p><strong>Note:</strong> In the future, Firefox will also remove the {{domxref("navigator.mediaDevices")}} property on insecure contexts, preventing all access to the {{domxref("MediaDevices")}} APIs; see {{bug()}} for the status of this work. <strong>This is already the case in Nightly builds.</strong></p>
  </div>
 </li>
</ul>

<h4 id="Canvas_and_WebGL">Canvas and WebGL</h4>

<h4 id="Removals_6">Removals</h4>

<ul>
 <li>Removed the non-standard {{DOMxRef("XMLDocument.load()")}} method ({{bug(332175)}}).</li>
 <li>Removed the non-standard {{DOMxRef("XMLDocument.async")}} property ({{bug(1328138)}}).</li>
</ul>

<h3 id="Security">Security</h3>

<p><em>No changes.</em></p>

<h4 id="Removals_7">Removals</h4>

<h3 id="Plugins">Plugins</h3>

<p><em>No changes.</em></p>

<h4 id="Removals_8">Removals</h4>

<h3 id="Other">Other</h3>

<p><em>No changes.</em></p>

<h4 id="Removals_9">Removals</h4>

<h2 id="Changes_for_add-on_developers">Changes for add-on developers</h2>

<h3 id="API_changes">API changes</h3>

<ul>
 <li>The The proxy.register() and proxy.unregister() functions have been deprecated and will be removed from Firefox 71 ({{bug(1545811)}}).</li>
</ul>

<h4 id="Removals_10">Removals</h4>

<h3 id="Manifest_changes">Manifest changes</h3>

<p><em>No changes.</em></p>

<h4 id="Removals_11">Removals</h4>

<h2 id="See_also">See also</h2>

<ul>
 <li><a href="https://www.fxsitecompat.com/en-CA/versions/68/">Site compatibility for Firefox 68</a></li>
</ul>

<h2 id="Older_versions">Older versions</h2>

<p>{{Firefox_for_developers(67)}}</p>