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---
title: Firefox 35 技術文件
slug: Mozilla/Firefox/Releases/35
translation_of: Mozilla/Firefox/Releases/35
---
<div><section class="Quick_links" id="Quick_Links">
<ol>
<li class="toggle">
<details>
<summary>Firefox developer release notes</summary>
<ol>
<li><a href="/zh-TW/docs/Mozilla/Firefox/Releases">Firefox developer release notes</a></li>
</ol>
</details>
</li>
<li class="toggle">
<details>
<summary>擴充套件</summary>
<ol>
<li><a href="/zh-TW/Add-ons/WebExtensions">瀏覽器擴充功能</a></li>
<li><a href="/zh-TW/Add-ons/Themes">主題</a></li>
</ol>
</details>
</li>
<li class="toggle">
<details>
<summary>Firefox internals</summary>
<ol>
<li><a href="/zh-TW/docs/Mozilla/">Mozilla project</a></li>
<li><a href="/zh-TW/docs/Mozilla/Gecko">Gecko</a></li>
<li><a href="/zh-TW/docs/Mozilla/Firefox/Headless_mode">Headless mode</a></li>
<li><a href="/zh-TW/docs/Mozilla/JavaScript_code_modules">JavaScript 程式碼模組</a></li>
<li><a href="/zh-TW/docs/Mozilla/js-ctypes">JS-ctypes</a></li>
<li><a href="/zh-TW/docs/Mozilla/MathML_Project">MathML 專案</a></li>
<li><a href="/zh-TW/docs/Mozilla/MFBT">MFBT</a></li>
<li><a href="/zh-TW/docs/Mozilla/Projects">Mozilla 專案</a></li>
<li><a href="/zh-TW/docs/Mozilla/Preferences">Preference system</a></li>
<li><a href="/zh-TW/docs/Mozilla/WebIDL_bindings">WebIDL bindings</a></li>
<li><a href="/zh-TW/docs/Mozilla/Tech/XPCOM">XPCOM</a></li>
<li><a href="/zh-TW/docs/Mozilla/Tech/XUL">XUL</a></li>
</ol>
</details>
</li>
<li class="toggle">
<details>
<summary>Building and contributing</summary>
<ol>
<li><a href="/zh-TW/docs/Mozilla/Developer_guide/Build_Instructions">建置教學</a></li>
<li><a href="/zh-TW/docs/Mozilla/Developer_guide/Build_Instructions/Configuring_Build_Options">Configuring build options</a></li>
<li><a href="/zh-TW/docs/Mozilla/Developer_guide/Build_Instructions/How_Mozilla_s_build_system_works">How the build system works</a></li>
<li><a href="/zh-TW/docs/Mozilla/Developer_guide/Source_Code/Mercurial">Mozilla 原始碼</a></li>
<li><a href="/zh-TW/docs/Mozilla/Localization">在地化</a></li>
<li><a href="/zh-TW/docs/Mozilla/Mercurial">Mercurial</a></li>
<li><a href="/zh-TW/docs/Mozilla/QA">Quality assurance</a></li>
<li><a href="/zh-TW/docs/Mozilla/Using_Mozilla_code_in_other_projects">在我們的專案中使用 Mozilla 程式碼</a></li>
</ol>
</details>
</li>
</ol>
</section></div><div>
{{ ReleaseChannelInfo("35", "35", "January 2015", "Aurora") }}</div>
<p>Want to help document Firefox 35? See the <a class="external" href="http://beta.elchi3.de/doctracker/#list=fx&version=35.0">list of bugs that need to be written about</a> and pitch in!</p>
<h2 id="Changes_for_Web_developers">Changes for Web developers</h2>
<h3 id="Developer_Tools">Developer Tools</h3>
<p>Highlights:</p>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Tools/Page_Inspector#.3A.3Abefore_and_.3A.3Aafter">See ::before and ::after pseudo elements in the Page Inspector</a></li>
<li><a href="https://developer.mozilla.org/en-US/docs/Tools/Style_Editor#Source_map_support">CSS source maps are now enabled by default</a></li>
<li><a href="https://developer.mozilla.org/en-US/docs/Tools/Page_Inspector#Element_popup_menu_2">"Show DOM Properties" from the Page Inspector</a></li>
</ul>
<p><a class="external-icon external" href="https://bugzilla.mozilla.org/buglist.cgi?resolution=FIXED&chfieldto=2014-10-13&chfield=resolution&query_format=advanced&chfieldfrom=2014-09-02&chfieldvalue=FIXED&component=Developer%20Tools&component=Developer%20Tools%3A%203D%20View&component=Developer%20Tools%3A%20Canvas%20Debugger&component=Developer%20Tools%3A%20Console&component=Developer%20Tools%3A%20Debugger&component=Developer%20Tools%3A%20Framework&component=Developer%20Tools%3A%20Graphic%20Commandline%20and%20Toolbar&component=Developer%20Tools%3A%20Inspector&component=Developer%20Tools%3A%20Memory&component=Developer%20Tools%3A%20Netmonitor&component=Developer%20Tools%3A%20Object%20Inspector&component=Developer%20Tools%3A%20Profiler&component=Developer%20Tools%3A%20Responsive%20Mode&component=Developer%20Tools%3A%20Scratchpad&component=Developer%20Tools%3A%20Source%20Editor&component=Developer%20Tools%3A%20Storage%20Inspector&component=Developer%20Tools%3A%20Style%20Editor&component=Developer%20Tools%3A%20Timeline&component=Developer%20Tools%3A%20User%20Stories&component=Developer%20Tools%3A%20Web%20Audio%20Editor&component=Developer%20Tools%3A%20WebGL%20Shader%20Editor&component=Developer%20Tools%3A%20WebIDE&component=Simulator&product=Firefox&product=Firefox%20OS&list_id=11184176">All devtools bugs fixed between Firefox 34 and Firefox 35</a>.</p>
<h3 id="CSS">CSS</h3>
<ul>
<li>The <a href="/zh-TW/docs/Web/CSS/mask-type" title="The documentation about this has not yet been written; please consider contributing!"><code>mask-type</code></a> property has been activated by default (<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1058519" title="FIXED: Ship mask-type CSS property">bug 1058519</a>).</li>
<li>The <a href="/zh-TW/docs/Web/CSS/filter" title="The documentation about this has not yet been written; please consider contributing!"><code>filter</code></a> property is now activated by default (<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1057180" title="FIXED: Turn on CSS Filters by default (by enabling about:config pref)">bug 1057180</a>).</li>
<li>The <a href="/zh-TW/docs/Web/CSS/@font-face" title="The @font-face CSS at-rule allows authors to specify online fonts to display text on their web pages. By allowing authors to provide their own fonts, @font-face eliminates the need to depend on the limited number of fonts users have installed on their computers. The @font-face at-rule may be used not only at the top level of a CSS, but also inside any CSS conditional-group at-rule."><code>@font-face</code></a> at-rule now supports WOFF2 fonts (<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1064737" title="FIXED: support WOFF2 fonts via @font-face">bug 1064737</a>).</li>
</ul>
<h3 id="HTML">HTML</h3>
<ul>
<li>The obsolete and non-conforming <code>bottommargin</code>, <code>leftmargin</code>, <code>rightmargin</code> and <code>topmargin</code> attributes of the <code><a href="/zh-TW/docs/Web/HTML/Element/body" title="The documentation about this has not yet been written; please consider contributing!"><code><body></code></a> element</code> have been activated in non-quirks mode (<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=95530" title="FIXED: topmargin and leftmargin attributes on the BODY element should be honored in all modes (not just Quirks mode)">bug 95530</a>).</li>
</ul>
<h3 id="JavaScript">JavaScript</h3>
<ul>
<li>The "<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let#Temporal_dead_zone_and_errors_with_let">temporal dead zone</a>" for <a href="/en-US/docs/Web/JavaScript/Reference/Statements/let"><code>let</code></a> declarations has been implemented. In conformance with ES6 <code>let</code> semantics, the following situations<br>
now throw errors. See also this<a href="https://groups.google.com/forum/#!topic/mozilla.dev.platform/tezdW299Zds"> newsgroup announcement</a> and <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1001090" title='FIXED: Implement ES6 "temporal dead zone" for let'>bug 1001090</a>.
<ul>
<li>Redeclaring existing variables or arguments using <code>let</code> within the same scope in function bodies is now a syntax error.</li>
<li>Using a variable declared using <code>let</code> in function bodies before the declaration is reached and evaluated is now a runtime error.</li>
</ul>
</li>
<li>ES6 <a href="/zh-TW/docs/Web/JavaScript/Reference/Symbols" title="The documentation about this has not yet been written; please consider contributing!"><code>Symbols</code></a> (only available in the Nightly channel) have been updated to conform with recent specification changes:
<ul>
<li><code>String(Symbol("1"))</code> now no longer throws a <a href="/zh-TW/docs/Web/JavaScript/Reference/TypeError" title="The documentation about this has not yet been written; please consider contributing!"><code>TypeError</code></a>; instead a string (<code>"Symbol(1)"</code>) gets returned (<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1058396" title="FIXED: String(aSymbol) now returns the symbol’s description in ES6 draft rev 27">bug 1058396</a>).</li>
</ul>
</li>
<li>The various <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray#TypedArray_objects"><em>TypedArray</em> constructors</a> now have as their <code>[[Prototype]]</code> a single function, denoted <code>%TypedArray%</code> in ES6 (but otherwise not directly exposed). Each typed array prototype now inherits from <code>%TypedArray%.prototype</code>. (<code>%TypedArray%</code> and <code>%TypedArray%.prototype</code> inherit from <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/prototype"><code>Function.prototype</code></a> and <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/prototype"><code>Object.prototype</code></a>, respectively, so that typed array constructors and instances still have the properties found on those objects.) Typed array function properties now reside on <code>%TypedArray%.prototype</code> and work on any typed array. See <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray#Description"><em>TypedArray</em></a> and <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=896116" title="FIXED: Implement ES6 %TypedArray% superclass that all ArrayBufferViews inherit from">bug 896116</a> for more information.</li>
<li>ES6 semantics for <a href="/en-US/docs/Web/JavaScript/Reference/Operators/Object_initializer#Prototype_mutation">prototype mutations using object literals</a> have been implemented (<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1061853" title="FIXED: Implement ES6 object-literal __proto__ restrictions/semantics">bug 1061853</a>).
<ul>
<li>Now only a single member notated as <code>__proto__:value</code> will mutate the <code>[[Prototype]]</code> in the object literal syntax.</li>
<li>Method members like <code>__proto__() {}</code> will not overwrite the <code>[[Prototype]]</code> anymore.</li>
</ul>
</li>
</ul>
<h3 id="InterfacesAPIsDOM">Interfaces/APIs/DOM</h3>
<ul>
<li>The <a href="/zh-TW/docs/Web/API/NavigatorLanguage" title="The documentation about this has not yet been written; please consider contributing!"><code>NavigatorLanguage</code></a> interface is now available to workers on <a href="/zh-TW/docs/Web/API/WorkerNavigator" title="The documentation about this has not yet been written; please consider contributing!"><code>WorkerNavigator</code></a> (<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=925849" title="FIXED: WorkerNavigator does not implement NavigatorLanguage">bug 925849</a>).</li>
<li>The <a href="/zh-TW/docs/Web/API/Element/closest" title="The documentation about this has not yet been written; please consider contributing!"><code>Element.closest</code></a> method returns the closest ancestor of the current element (<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1055533" title="FIXED: Implement Element.closest()">bug 1055533</a>).</li>
</ul>
<h3 id="MathML">MathML</h3>
<ul>
<li>The <code>dtls</code> OpenType feature (via the CSS <a href="/zh-TW/docs/Web/CSS/font-feature-settings" title="The documentation about this has not yet been written; please consider contributing!"><code>font-feature-settings</code></a> on the default stylesheet) is now applied automatically to MathML elements when positioning scripts over it (e.g. dotless i with mathematical hat).</li>
</ul>
<h3 id="SVG">SVG</h3>
<p><em>No change.</em></p>
<h3 id="AudioVideo">Audio/Video</h3>
<p><em>No change.</em></p>
<h2 id="Security">Security</h2>
<ul>
<li>The <a href="/en-US/docs/Web/Security/Public_Key_Pinning">Public Key Pinning</a> Extension for HTTP (HPKP) has been implemented. (<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=787133" title="FIXED: Implement Public Key Pinning Extension for HTTP (HPKP)">bug 787133</a>)</li>
</ul>
<h2 id="Changes_for_add-on_and_Mozilla_developers">Changes for add-on and Mozilla developers</h2>
<h3 id="XUL">XUL</h3>
<ul>
<li>The private <code>_getTabForBrowser()</code> method on the <code><a href="/zh-TW/docs/Mozilla/Tech/XUL/tabbrowser" title="tabbrowser">tabbrowser</a></code> element has been deprecated. In its place, we've added a new, public, method called <span id="m-getTabForBrowser"><code><a href="https://developer.mozilla.org/zh-TW/docs/Mozilla/Tech/XUL/Method/getTabForBrowser">getTabForBrowser</a></code></span>. This returns, predictably, the <code><a href="/zh-TW/docs/Mozilla/Tech/XUL/tab" title="tab">tab</a></code> element that contains the specified <code><a href="/zh-TW/docs/Mozilla/Tech/XUL/browser" title="browser">browser</a></code>.</li>
</ul>
<h2 id="Older_versions">Older versions</h2>
<div class="multiColumnList">
<ul>
<li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/34">Firefox 34 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/33">Firefox 33 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/32">Firefox 32 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/31">Firefox 31 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/30">Firefox 30 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/29">Firefox 29 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/28">Firefox 28 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/27">Firefox 27 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/26">Firefox 26 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/25">Firefox 25 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/24">Firefox 24 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/23">Firefox 23 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/22">Firefox 22 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/21">Firefox 21 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/20">Firefox 20 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/19">Firefox 19 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/18">Firefox 18 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/17">Firefox 17 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/16">Firefox 16 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/15">Firefox 15 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/14">Firefox 14 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/13">Firefox 13 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/12">Firefox 12 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/11">Firefox 11 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/10">Firefox 10 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/9">Firefox 9 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/8">Firefox 8 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/7">Firefox 7 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/6">Firefox 6 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/5">Firefox 5 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/4">Firefox 4 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/3.6">Firefox 3.6 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/3.5">Firefox 3.5 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/3">Firefox 3 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/2">Firefox 2 for developers</a></li><li><a href="/zh-TW/docs/Mozilla/Firefox/Releases/1.5">Firefox 1.5 for developers</a></li></ul>
</div>
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