path: root/files/fr/mozilla/firefox/releases/63/index.html

---
title: Firefox 63 for developers
slug: Mozilla/Firefox/Releases/63
tags:
  - '63'
  - Firefox
  - Mise à jour
  - Mozilla
translation_of: Mozilla/Firefox/Releases/63
original_slug: Mozilla/Firefox/Versions/63
---
<div>{{FirefoxSidebar}}</div>

<p class="summary">Cet article fournit des informations à propos des changements dans Firefox 63 qui affecteront les développeurs. Firefox 63 a été publié le 23 octobre 2018.</p>

<h2 id="Changements_pour_les_développeurs_web">Changements pour les développeurs web</h2>

<h3 id="Outils_de_développeurs">Outils de développeurs</h3>

<ul>
 <li>L'onglet Polices dans la page de l<a href="/en-US/docs/Tools/Page_Inspector">'Inspecteur</a> inclus maintenant un éditeur facilitant la visualisation et l'édition des paramètres des polices sur votre page. Voir <a href="/en-US/docs/Tools/Page_Inspector/How_to/Edit_fonts">l'édition des polices</a> pour plus d'informations.</li>
 <li>L'<a href="/en-US/docs/Tools/Accessibility_inspector">Inspecteur d'Accessibilité</a> est maintenant activé par défaut ({{bug(1482454)}}).</li>
 <li>Lorsque vous survolez un objet dans l'<a href="/en-US/docs/Tools/Accessibility_inspector">Inspecteur d'Accessibilité</a>, <a href="/en-US/docs/Tools/Accessibility_inspector#Highlighting_of_UI_items">l'élément est mis en évidence</a> et son rôle et nom seront affichés dans une barre d'information dans la page ({{bug(1473030)}}).</li>
 <li>La ligne de commande dans la <a href="/en-US/docs/Tools/Web_Console">Console Web</a> est maintenant immédiatement affichée après le flux de sortie de la console ({{bug(1136299)}}).</li>
 <li>Une nouvelle icône a été ajouté au contenu dans le <a href="/en-US/docs/Tools/Network_Monitor">Moniteur Réseau</a> indiquant si une URL appartient à un trackeur connu — voir les <a href="/en-US/docs/Tools/Network_Monitor/request_list#Security_icons">Icônes de Sécurité</a> ({{bug(1333994)}}).</li>
 <li>La valeur par défaut de <code>devtools.aboutdebugging.showSystemAddons</code> est maintenant <code>false</code>, ce qui signifie que le système d'add-ons ne sera plus listé dans la page <code>about:debugging</code>. Vous pouvez changer les paramètres en vous rendant sur la page <code>about:config</code> ({{bug(1425347)}}).</li>
 <li>La barre d'outils du <a href="/en-US/docs/Tools/Responsive_Design_Mode">Mode Responsive Design</a> a été simplifiée, et nous avons ajouté une option pour aligner la vue à gauche.</li>
 <li>L'Inspecteur inclus un <a href="/en-US/docs/Tools/Page_Inspector/How_to/Examine_and_edit_HTML#Custom_element_definition">lien vers la définition de la classe</a> pour un élément personnalisé. ({{bug(1443923)}}).</li>
</ul>

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

<ul>
 <li>Ajout du support pour l'attribut <code>decoding</code> de l'élément {{HTMLElement("img")}} ({{bug(1416328)}}); Voir aussi {{DOMxRef("HTMLImageElement.decoding")}}.</li>
</ul>

<h4 id="Suppressions">Suppressions</h4>

<ul>
 <li>Le lien de type <code>sidebar</code> (<code>rel="sidebar"</code>) n'est plus supporté. Si une ancre contient cet attribut, elle sera ignorée ({{bug(1452645)}}).</li>
</ul>

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

<ul>
 <li>Support for the {{CSSxRef(":defined")}} pseudo-class has been added ({{bug(1331334)}}).</li>
 <li>Support for {{CSSxRef("row-gap")}}, {{CSSxRef("column-gap")}} and {{CSSxRef("gap")}} has been added in <a href="/en-US/docs/Web/CSS/CSS_Box_Alignment/Box_Alignment_in_Flexbox#The_gap_properties">Flexbox layout</a> ({{bug(1398483)}}).</li>
 <li>Re-enabled support for <a href="/en-US/docs/Web/CSS/@media/-webkit-device-pixel-ratio">webkit-prefixed pixel-density @media queries</a> ({{bug(1444139)}}).</li>
 <li>Support added for the <a href="/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout">CSS Flexible Box Layout</a> (Flexbox) properties {{CSSxRef("align-self")}}, {{CSSxRef("align-content")}}, and {{CSSxRef("align-items")}} as well as the {{CSSxRef("justify-content")}} property ({{bug(1472843)}}).</li>
 <li>Implemented the <code>path()</code> function for {{CSSxRef("offset-path")}} ({{bug(1429298)}}).</li>
 <li>Implemented <a href="/en-US/docs/Web/CSS/Media_Queries/Using_media_queries#Syntax_improvements_in_Level_4">syntax improvements from the Media Queries Level 4 specification</a> ({{bug(1472843)}}).</li>
 <li>Renamed <code>offset-*</code> properties to {{CSSxRef("inset-block-start")}}, {{CSSxRef("inset-block-end")}}, {{CSSxRef("inset-inline-start")}}, and {{CSSxRef("inset-inline-end")}} ({{bug(1464782)}}).</li>
 <li>Added support for the <a href="/en-US/docs/Web/CSS/@media/prefers-reduced-motion">prefers-reduced-motion</a> media feature ({{bug(1365045)}}, {{bug(1475462)}}).</li>
 <li>Added flow relative values (<code>block</code>, <code>inline</code>) for the {{CSSxRef("resize")}} property ({{bug(1464786)}}).</li>
 <li>Implemented flexbox layout for <code>safe</code> &amp; <code>unsafe</code> values in {{CSSxRef("align-self")}}, {{CSSxRef("align-content")}}, and {{CSSxRef("justify-content")}} ({{bug(1297774)}}).</li>
 <li>The <a href="/en-US/docs/Web/CSS/CSS_Logical_Properties">logical properties</a> (where appropriate) are now animatable ({{bug(1309752)}}).</li>
</ul>

<h4 id="Suppressions_2">Suppressions</h4>

<ul>
 <li>Removed <code>offset-block-start</code>, <code>offset-block-end</code>, <code>offset-inline-start</code> and <code>offset-inline-end</code>; these have been renamed to <code>inset-*</code>, as described above ({{bug(1464782)}}).</li>
</ul>

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

<p><em>Aucun changement.</em></p>

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

<ul>
 <li>The {{JSxRef("Symbol.prototype.description")}} property has been implemented ({{bug(1472170)}}).</li>
 <li>The {{JSxRef("Object.fromEntries()")}} method has been added ({{bug(1469019)}}).</li>
 <li>When you try to access a property of an undefined object, the error message is now much improved. Considering the case where <code>x</code> is undefined and you try to access <code>x.y</code>, instead of <code>TypeError: x is undefined</code> the console now returns the more descriptive <code><a href="/en-US/docs/Web/JavaScript/Reference/Errors/cant_access_property">x is undefined; can't access its "y" property</a></code> ({{bug(1259822)}}).</li>
</ul>

<h4 id="Suppressions_3">Suppressions</h4>

<ul>
 <li>Experimental WebAssembly Module IndexedDB serialization support has been removed ({{bug(1469395)}}).</li>
</ul>

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

<h4 id="Nouvelles_APIs">Nouvelles APIs</h4>

<ul>
 <li>The Shadow DOM ({{bug(1471947)}}) and Custom Elements ({{bug(1471948)}}) APIs have been enabled by default; See <a href="/en-US/docs/Web/Web_Components">Web components</a> for more details.</li>
 <li>The {{domxref("Media_Capabilities_API", "Media Capabilities API", "", "1")}} been implemented ({{bug(1409664)}}).</li>
 <li>The {{domxref("Clipboard", "Async Clipboard API", "", "1")}} has been implemented and enabled by default for all channels ({{bug(1461465)}}). As is the case with Chrome, Firefox currently implements only the {{domxref("Clipboard.writeText", "writeText()")}} and {{domxref("Clipboard.readText", "readText()")}} methods; however, unlike Chrome, <code>readText()</code> is only available in <a href="/en-US/docs/Mozilla/Add-ons/WebExtensions">browser extensions</a>.</li>
 <li>The {{DOMxRef("SecurityPolicyViolationEvent")}} interface is now supported. It allows sending events when the {{HTTPHeader("Content-Security-Policy")}} is violated ({{bug(1472661)}}).</li>
</ul>

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

<ul>
 <li>The following portions of the {{domxref("Web_Animations_API", "Web Animations API", "", "1")}} have been enabled by default (see {{bug(1476158)}}):
  <ul>
   <li>The {{DOMxRef("Animation")}} properties {{DOMxRef("Animation.ready", "ready")}} and {{DOMxRef("Animation.finished", "finished")}}, specifying the <code>Animation</code> object's <code>ready</code> and <code>finished</code> {{JSxRef("Promise")}}s.</li>
   <li>The {{DOMxRef("Animation")}} object's {{DOMxRef("Animation.effect", "effect")}} property.</li>
   <li>The interfaces {{DOMxRef("KeyframeEffect")}} and {{DOMxRef("AnimationEffect")}}.</li>
  </ul>
 </li>
 <li>The {{DOMxRef("Element.toggleAttribute()")}} method has been implemented ({{bug(1469592)}}).</li>
 <li>The historical, previously non-standard, {{DOMxRef("Event.returnValue")}} property is now supported for compatibility purposes ({{bug(1452569)}}).</li>
 <li>We implemented the {{DOMxRef("Window.event")}} property to improve web compatibility, now that it's become standard ({{bug(218415)}}).</li>
 <li>To bring Firefox into alignment with Edge and Chrome, the {{DOMxRef("NavigatorID.platform", "navigator.platform")}} property now returns <code>"Win32"</code> even when running on 64-bit Windows ({{bug(1472618)}}).</li>
 <li>Prior to Firefox 63, links that open new windows that had <code>rel="noopener"</code>, as well as calls to {{DOMxRef("Window.open()")}} with the <code><a href="/en-US/docs/Web/API/Window/open#noopener">noopener</a></code> window feature enabled would default to having all window features disabled, so that you had to explicitly re-enable any standard features you wanted. Now these windows have the same set of features enabled as any other window, and you need to explicitly turn off any you don't want ({{bug(1419960)}}).</li>
</ul>

<h4 id="Evénements_du_DOM">Evénements du DOM</h4>

<ul>
 <li>Handling of the <kbd>Alt</kbd> key <em>on the right side</em> of the keyboard has been improved on Windows. If the user's current keyboard layout maps the <kbd>Alt</kbd> key to the <kbd>AltGr</kbd> modifier key, the value of {{DOMxRef("KeyboardEvent.key")}} is now reported as <code>"AltGraph"</code>. This behavior matches the behavior recently introduced in Chrome ({{bug(900750)}}).</li>
</ul>

<h4 id="Media_Web_Audio_et_WebRTC">Media, Web Audio, et WebRTC</h4>

<ul>
 <li>Microphone access now works simultaneously in multiple tabs, even within the same content process ({{bug(1404977)}}).</li>
 <li>{{DOMxRef("RTCDataChannel")}} has been updated to support the sctp-sdp-21 data format for the data, in addition to the older sctp-sdp-05 format previously supported.</li>
 <li>The {{DOMxRef("ConstantSourceNode")}} node type for Web Audio API now has a default channel count of 2 rather than 1, in order to match the specification ({{bug(1413283)}}).</li>
 <li>The {{domxref("Web_Audio_API", "Web Audio API", "", "1")}} interface {{DOMxRef("AudioScheduledSourceNode")}} (and by extension, all the other node types based on it) now throw the correct exception when a negative value is specified for the node start time. That error is <code>RangeError</code> ({{bug(1413284)}}).</li>
 <li>The minimum and maximum permitted values for an {{DOMxRef("AudioParam")}} object's {{DOMxRef("AudioParam.value", "value")}} have been changed to the minimum negative single-precision floating-point value (-340,282,346,638,528,859,811,704,183,484,516,925,440) and the maximum positive single-precision floating-point value (+340,282,346,638,528,859,811,704,183,484,516,925,440) respectively ({{bug(1476695)}}).</li>
 <li>The {{DOMxRef("SourceBuffer.changeType")}} method, which allows you to change codecs during an active stream, has been enabled by default. This is part of the {{domxref("Media_Source_Extensions_API", "Media Source Extensions API", "", "1")}} ({{bug(1481166)}}).</li>
 <li>The {{DOMxRef("AudioParam.setValueCurveAtTime()")}} method has been updated to correctly accept an array of floating-point values to indicate the parameter's values to change to over time. Previously, it required a {{DOMxRef("Float32Array")}} ({{bug(1421091)}}).</li>
 <li>{{DOMxRef("AudioParam.setValueCurveAtTime()")}} has also been updated to correctly return a proper <code>TypeError</code> when a non-finite value is found in the <code>values</code> array ({{bug(1472095)}}).</li>
 <li>In addition, <code>setValueCurveAtTime()</code> has been updated to ensure that, when the parameter finishes following the specified value curve after the duration elapses, the value of the parameter is set to the last value in the list of values to curve through ({{bug(1308436)}}).</li>
 <li>The <code>RTCRTPStreamStats</code> dictionary has been renamed to {{DOMxRef("RTCRtpStreamStats")}} for consistency with other WebRTC dictionaries and the specification ({{bug(1480498)}}).</li>
 <li>Support for the <code>RTCRtpStreamStats</code> dictionary's {{DOMxRef("RTCRtpStreamStats.kind", "kind")}} property has been added ({{bug(1481851)}}).</li>
 <li>The {{DOMxRef("RTCRtpStreamStats")}} dictionary's {{DOMxRef("RTCRtpStreamStats.isRemote", "isRemote")}} property is deprecated and will be removed in Firefox 65. A warning is now output to console when this property is accessed. See <a href="https://blog.mozilla.org/webrtc/getstats-isremote-65/">this blog post on the Advancing WebRTC blog</a> for details ({{bug(1393306)}}).</li>
</ul>

<h4 id="Canvas_et_WebGL">Canvas et WebGL</h4>

<ul>
 <li>A new <code>powerPreference</code> context attribute has been added to {{DOMxRef("HTMLCanvasElement.getContext()")}}. On macOS this allows WebGL non-performance-critical applications and applets to request the low-power GPU instead of the high-power GPU in multi-GPU systems ({{bug(1349799)}}).</li>
</ul>

<h4 id="Suppressions_4">Suppressions</h4>

<ul>
 <li>The obsolete and non-standard Firefox-only methods {{DOMxRef("Window.back()")}} and {{DOMxRef("Window.forward()")}} have been removed. Please use the {{DOMxRef("History.back", "window.history.back()")}} and {{DOMxRef("History.forward", "window.history.forward()")}} methods instead ({{bug(1479486)}}).</li>
 <li>The {{DOMxRef("URL.createObjectURL", "createObjectURL()")}} and {{DOMxRef("URL.revokeObjectURL", "revokeObjectURL()")}} methods are no longer available on {{DOMxRef("ServiceWorker")}} instances due to the potential they introduced for memory leaks to occur ({{bug(1264182)}}).</li>
 <li>Since it was deprecated in the specification anyway, the limited support for Doppler effects on {{DOMxRef("PannerNode")}} has been removed from the Web Audio API. The {{DOMxRef("AudioListener")}} properties {{DOMxRef("AudioListener.dopplerFactor", "dopplerFactor")}} and {{DOMxRef("AudioListener.speedOfSound", "speedOfSound")}} have been removed, along with the <code>PannerNode</code> method {{DOMxRef("PannerNode.setVelocity", "setVelocity()")}} ({{bug(1148354)}}).</li>
</ul>

<h3 id="CSSOM">CSSOM</h3>

<p><em>Aucun changement.</em></p>

<h3 id="HTTP">HTTP</h3>

<ul>
 <li>The {{HTTPHeader("Clear-Site-Data")}} header is implemented and no longer behind a preference ({{bug(1470111)}}).</li>
</ul>

<h3 id="Sécurité">Sécurité</h3>

<ul>
 <li>Site favicons are now subject to <a href="/en-US/docs/Web/HTTP/CSP">Content Security Policy</a>, if one is configured for the site ({{bug(1297156)}}).</li>
 <li>CSP <code>script-src</code> directive's <code>'report-sample'</code> expression now recognized when generating violation reports. This directive indicates that a short sample of where the violation occurred should be included in the report. Previously, Firefox always included this sample ({{bug(1473218)}}).</li>
 <li>Firefox now uses NSS 3.39 ({{bug(1470914)}}).</li>
</ul>

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

<p><em>Aucun changement.</em></p>

<h3 id="Conformités_WebDriver_(Marionette)">Conformités WebDriver (Marionette)</h3>

<h4 id="Nouvelles_fonctionnalités">Nouvelles fonctionnalités</h4>

<ul>
 <li>Marionette now returns a <code>setWindowRect</code> <a href="/en-US/docs/Web/WebDriver/Capabilities">capability</a> in the <code>WebDriver:NewSession</code> response that is true if the browser window can be repositioned and resized, which e.g. is the case for Firefox but not any mobile applications ({{bug(1470659)}}).</li>
 <li>Added support for the <code>unhandledPromptBehavior</code> capability, which allows to define a specific <a href="https://w3c.github.io/webdriver/#dfn-user-prompt-handler">prompt behavior</a> of the WebDriver specification ({{bug(1264259)}}).</li>
 <li>Handling of user prompts has been added to the <code>WebDriver:ExecuteScript</code> and <code>WebDriver:ExecuteAsyncScript</code> commands ({{bug(1439995)}}).</li>
</ul>

<h4 id="Changements_API">Changements API</h4>

<ul>
 <li>Deprecated command end-points without the <code>WebDriver:</code> prefix have been removed ({{bug(1451725)}}).</li>
 <li>The <code>WebDriver:NewSession</code> command returns recommended strings (<code>linux</code>, <code>mac</code>, <code>windows</code>) for <code>platformName</code> as defined in the WebDriver specification ({{bug(1470646)}}).</li>
</ul>

<h4 id="Corrections_de_bugs">Corrections de bugs</h4>

<ul>
 <li>Focus related events were missing on element interaction when Firefox was not running as the top-most application ({{bug(1398111)}}).</li>
 <li>Performing a <code>pointerDown</code> and <code>pointerUp</code> action in a subsequent action sequence could trigger a double click because <code>WebDriver:ReleaseActions</code> didn't reset the double click tracker ({{bug(1422583)}}).</li>
 <li>Executing <code>pause</code> actions repeatedly could cause an infinite hang ({{bug(1447449)}}).</li>
 <li>Fixed a bug where returning an element collection from <code>WebDriver:ExecuteScript</code> and <code>WebDriver:ExecuteAsyncScript</code> would cause a cyclic reference error ({{bug(1447977)}}).</li>
 <li>To prevent a race condition both the <code>WebDriver:AcceptAlert</code> and <code>WebDriver:DismissAlert</code> commands now wait until the user prompt has been closed ({{bug(1479368)}}).</li>
 <li>Log entries as emitted by the frame script were no longer limited by <code>MarionettePrefs.logLevel</code> but logged everything ({{bug(1482829)}}).</li>
 <li><code>WebDriver:TakeScreenshot</code> raised an error when taking a screenshot of a window larger than 32767 pixels in width or height ({{bug(1485730)}}).</li>
 <li><code>WebDriver:SendAlertText</code> didn't replace default user prompt value if text to send is an empty string ({{bug(1486485)}}).</li>
</ul>

<h3 id="Autre">Autre</h3>

<ul>
 <li>Corrected the behavior of {{DOMxRef("PerformanceObserver.observe()")}} to simply do nothing if no valid entry types are found in the specified array of entry types to observe, or if the array is empty or missing. Previously, Firefox was incorrectly throwing a <code>TypeError</code> ({{bug(1403027)}}).</li>
 <li>In <a href="/en-US/docs/Web/OpenSearch">OpenSearch</a>, Firefox now accepts <code>application/json</code> as a search URL type, as an alias of <code>application/x-suggestions+json</code> ({{bug(1425827)}}).</li>
</ul>

<h2 id="Changements_des_add-on_développeurs">Changements des add-on développeurs</h2>

<h3 id="Changements_API_2">Changements API</h3>

<h4 id="Thèmes">Thèmes</h4>

<ul>
 <li>The default text color for {{WebExtAPIRef("browserAction")}} badges is now automatically set to black or white, to maximise contrast with the background ({{bug(1474110)}}).</li>
 <li>The <code>accentcolor</code> and <code>textcolor</code> properties of the <code><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/theme">theme</a></code> manifest key are now optional ({{bug(1413144)}}).</li>
 <li>{{WebExtAPIRef("browserAction.getBadgeTextColor()")}} and {{WebExtAPIRef("browserAction.setBadgeTextColor()")}} enable you to get and set the text color of browser action badges ({{bug(1424620)}}).</li>
 <li>The theme <code>colors</code> key in <code>manifest.json</code> now supports the <code>ntp_text</code> property to set the text color in a new tab, and the <code>ntp_background</code> property to set the color of a new tab ({{bug(1347204)}}).</li>
 <li>Themes can now define the colors for sidebars, such as the bookmarks sidebar ({{bug(1418602)}}). The relevant properties include:
  <ul>
   <li><code>sidebar</code>: The background color for sidebars.</li>
   <li><code>sidebar_text</code>: The text color for sidebars.</li>
   <li><code>sidebar_highlight</code>: The background color of a selected item in a sidebar.</li>
   <li><code>sidebar_highlight_text</code>: The text color of a selected item in a sidebar.</li>
  </ul>
 </li>
 <li>The method {{WebExtAPIRef("management.install()")}} allows web extensions to install and enable signed browser themes ({{bug(1369209)}}).</li>
</ul>

<h4 id="Recherche">Recherche</h4>

<ul>
 <li>The new {{WebExtAPIRef("search")}} AP<a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/search">I</a> enables you to retrieve the list of installed search engines and perform searches with them ({{bug(1352598)}}).</li>
 <li>{{WebExtAPIRef("topSites.get()")}} now takes an <code>options</code> parameter enabling you to set various options for the list of sites returned ({{bug(1445836)}}).</li>
</ul>

<h4 id="Onglets">Onglets</h4>

<ul>
 <li>{{WebExtAPIRef("tabs.onHighlighted")}} now supports multi-select ({{bug(1474440)}}).</li>
 <li>{{WebExtAPIRef("tabs.highlight")}} now includes an optional field in the <code>highlightInfo</code> object — <code>populate</code> — which defaults to <code>true</code>. Setting it to <code>false</code> prevents the returned <code>windows.Window</code> object from being populated with a list of tabs, to improve performance ({{bug(1489814)}}).</li>
 <li>{{WebExtAPIRef("tabs.update")}} now supports changing the selection status of a tab by including <code>highlighted: true</code> in the <code>updateProperties</code> parameter ({{bug(1479129)}}).</li>
 <li>{{WebExtAPIRef("tabs.update")}} supports changing the selection status of a tab without changing the focused tab ({{bug(1486050)}}) by including both <code>highlighted: true</code> and <code>active: false</code> in the <code>updateProperties</code> parameter.</li>
 <li>{{WebExtAPIRef("tabs.query")}} now returns an array of {{WebExtAPIRef("tabs.Tab")}} objects if multiple tabs are selected ({{bug(1465170)}}).</li>
 <li>The {{WebExtAPIRef("tabs.Tab")}} property now properly reflects which tabs in a browser window are selected (highlighted) and {{WebExtAPIRef("tabs.highlight")}} supports changing the highlighted status of multiple tabs ({{bug(1464862)}}).</li>
 <li>The <code>isarticle</code> property in the <code>extraParameters</code> object passed into {{WebExtAPIRef("tabs.onUpdated")}} has been renamed to <code>isArticle</code>. The old name is retained but deprecated. This change was uplifted to Firefox 62 ({{bug(1461695)}}).</li>
 <li>The {{WebExtAPIRef('tabs.onUpdated')}} event can be used to track when a tab is drawing the user's attention with <code>attention</code> property of the <code>changeInfo</code> object ({{bug(1396684)}}).</li>
</ul>

<h4 id="Menus">Menus</h4>

<ul>
 <li>Added {{WebExtApiRef("menus.getTargetElement()")}} to the {{WebExtApiRef("menus")}} API. The method returns the clicked on element referenced by the <code>targetElementId</code> parameter ({{bug(1325814)}}).</li>
 <li>{{WebExtAPIRef("menus.create()")}} now enables you to create invisible menu items, and {{WebExtAPIRef("menus.update()")}} enables you to toggle menu item visibility ({{bug(1482529)}}).</li>
 <li>Items created using the {{WebExtAPIRef("menus")}} API now support access keys ({{bug(1320462)}}).</li>
 <li>The <code>targetUrlPatterns</code> parameter of {{WebExtApiRef("menus.create()")}} and {{WebExtApiRef("menus.update()")}} now supports any URL scheme, even those that are usually not allowed in a match pattern ({{bug(1280370)}}).</li>
</ul>

<h4 id="Autre_2">Autre</h4>

<ul>
 <li>{{WebExtAPIRef("commands.onCommand")}} is now treated as <a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/User_actions">user input</a> ({{bug(1408129)}}).</li>
 <li>The {{WebExtAPIRef("webRequest")}} API now enables you to filter for speculative connections ({{bug(1479565)}}).</li>
 <li>{{WebExtAPIRef("webRequest.SecurityInfo")}} adds two new properties, <code>keaGroupName</code> and <code>signatureSchemeName</code>. This change was uplifted to Firefox 62 ({{bug(1471959)}}).</li>
 <li>{{WebExtAPIRef("cookies.Cookie")}} now includes a property indicating the SameSite state of the cookie. The {{WebExtAPIRef("cookies.SameSiteStatus")}} enumeration defines SameSite state values ({{bug(1351663)}}).</li>
 <li>Match patterns for URLs now explicitly match the "data" URL scheme ({{bug(1280370)}}).</li>
</ul>

<h2 id="Voir_aussi">Voir aussi</h2>

<ul>
 <li><a href="https://www.fxsitecompat.com/en-CA/versions/63/">Compatibilité dees sites pour Firefox 63</a></li>
</ul>

<h2 id="Anciennes_versions">Anciennes versions</h2>

<p>{{Firefox_for_developers(62)}}</p>