path: root/files/zh-tw/mozilla/firefox/releases/8/index.html

---
title: Firefox 8 技術文件
slug: Mozilla/Firefox/Releases/8
translation_of: Mozilla/Firefox/Releases/8
---
<div><section id="Quick_links">
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            <summary>Firefox developer release notes</summary>
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              <li><a href="/zh-TW/docs/Mozilla/Firefox/Releases">Firefox developer release notes</a></li>
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            <summary>擴充套件</summary>
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              <li><a href="/zh-TW/Add-ons/WebExtensions">瀏覽器擴充功能</a></li>
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            <summary>Firefox internals</summary>
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              <li><a href="/zh-TW/docs/Mozilla/">Mozilla project</a></li>
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              <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>
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              <li><a href="/zh-TW/docs/Mozilla/Tech/XPCOM">XPCOM</a></li>
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            <summary>Building and contributing</summary>
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              <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>
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</section></div><p>Firefox 8 was released on November 8, 2011. This article provides information both for <a href="/en/Firefox_8_for_developers#Changes_for_web_developers" title="en/Firefox_8_for_developers#Changes_for_web_developers">web developers</a> and for add-on and <a href="/en/Firefox_8_for_developers#Changes_for_Mozilla_and_add-on_developers" title="en/Firefox_8_for_developers#Changes_for_Mozilla_and_add-on_developers">Mozilla project developers</a> to help take full advantage of the features of this release.</p>

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

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

<ul>
 <li>The <a href="/zh-TW/docs/Web/API/HTMLImageElement" title="HTMLImageElement 介面提供了特殊的屬性及方法以用來操作 &lt;img> 元素的畫面佈局與外觀呈現。"><code>HTMLImageElement</code></a> <code>crossOrigin</code> property has been added and the <code><a href="/zh-TW/docs/Web/HTML/Element/img#attr-crossorigin">crossorigin</a></code> attribute has been added to the <a href="/zh-TW/docs/Web/HTML/Element/img" title="The documentation about this has not yet been written; please consider contributing!"><code>&lt;img&gt;</code></a> element. (see <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=664299" title="FIXED: Add crossorigin attribute">bug 664299</a>)</li>
 <li>The <a href="/zh-TW/docs/Web/API/HTMLSelectElement#add()" title=""><code>HTMLSelectElement.add()</code></a> method now supports either an item or index of an item that the new item should be inserted before. Previously it only supported an item. (see <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=666200" title="FIXED: support select.add(element, long before)">bug 666200</a>)</li>
 <li>The <code>HTMLIsIndexElement</code> constructor has been removed. No elements have implemented this interface since before Firefox 4.</li>
 <li>The HTML5 "context menu" feature (<code>contextmenu</code> attribute), which lets you add custom element specific items to native context menu, is now supported (the implementation is still experimental awaiting changes in the specification; see <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=617528" title='FIXED: implement the HTML5 "context menu" feature (contextmenu attribute)'>bug 617528</a>).</li>
 <li>Support for the <a href="/en/HTML/Global_attributes#attr-accesskeylabel" title="https://developer.mozilla.org/en/HTML/Global_attributes#attr-accesskeylabel"><code>accesskeylabel</code></a> attribute has been added to all elements.</li>
 <li>The <a href="/zh-TW/docs/Web/HTML/Element/input" title="The HTML &lt;input> element is used to create interactive controls for web-based forms in order to accept data from the user."><code>&lt;input&gt;</code></a> and <a href="/zh-TW/docs/Web/HTML/Element/textarea" title="The documentation about this has not yet been written; please consider contributing!"><code>&lt;textarea&gt;</code></a> elements now support the <code>selectionDirection</code> attribute, and their <code>setSelectionRange()</code> methods have been updated to support optionally specifying a direction.</li>
 <li>Most elements now get a focus ring drawn around them if they've been made focusable by using the <code>tabindex</code> attribute and the user then focuses the element.</li>
 <li>In a set of nested <a href="/zh-TW/docs/Web/HTML/Element/label" title="The documentation about this has not yet been written; please consider contributing!"><code>&lt;label&gt;</code></a> elements click events do no longer trigger multiple <label> elements, which caused Firefox to stop responding in the past (see <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=646157" title="FIXED: Stops responding when selecting a checkbox on the Netapp admin page inside deeply nested &lt;label>s">bug 646157</a>).</label></li>
</ul>

<h3 id="DOM">DOM</h3>

<ul>
 <li>The <a href="/zh-TW/docs/Web/API/Element/insertAdjacentHTML" title="insertAdjacentHTML() 把傳入的字串解析成 HTML 或 XML，並把該節點插入到 DOM 樹指定的位置。它不會重新解析被使用的元素，因此他不會破壞該元素裡面原有的元素。這避免了序列化的複雜步驟，使得它比直接操作  innerHTML 快上許多。"><code>insertAdjacentHTML</code></a> method has been implemented.</li>
 <li><a href="/zh-TW/docs/Web/API/BlobBuilder" title="The documentation about this has not yet been written; please consider contributing!"><code>BlobBuilder</code></a> now has a <code>getFile()</code> method that returns the content of the blob as a file.</li>
 <li>The <a href="/zh-TW/docs/Web/API/FileReaderSync" title="The documentation about this has not yet been written; please consider contributing!"><code>FileReaderSync</code></a> interface (part of the FileAPI) has been implemented.</li>
 <li>Event handling in nested <a href="/zh-TW/docs/Web/HTML/Element/label" title="The documentation about this has not yet been written; please consider contributing!"><code>&lt;label&gt;</code></a>s has been fixed.</li>
 <li>You can now use <a href="/zh-TW/docs/Web/API/Window/postMessage" title="The documentation about this has not yet been written; please consider contributing!"><code>window.postMessage()</code></a> to pass <a href="/zh-TW/docs/Web/API/File" title="File 介面提供了檔案的資訊並且允許網頁中的 JavaScript 存取檔案的內容。"><code>File</code></a> and <a href="/zh-TW/docs/Web/API/FileList" title='FileList 型別物件通常來自 HTML &amp;lt;input> 元素 DOM 物件的 files 屬性（property）。你可以操作 FileList 物件來存取使用者透過 &amp;lt;input type="file"> 元素所選取的檔案，或由拖放操作所產生的檔案（請參考 DataTransfer 物件的更多使用細節）。'><code>FileList</code></a> objects between windows.</li>
 <li>When editing <a href="/zh-TW/docs/Web/API/Element/contenteditable" title="The documentation about this has not yet been written; please consider contributing!"><code>element.contenteditable</code></a> areas, exiting a heading by pressing return, or exiting list editing mode by pressing return twice, now returns to paragraph entry mode (that is, paragraphs inside <a href="/zh-TW/docs/Web/HTML/Element/p" title="The documentation about this has not yet been written; please consider contributing!"><code>&lt;p&gt;</code></a> blocks) instead of separating lines by <a href="/zh-TW/docs/Web/HTML/Element/br" title="HTML &lt;br> 元素會產生文字的斷行（carriage-return、CR 或是確認鍵）。此元素主要用於寫詩或寫住址，這種斷行有所意義的時候。"><code>&lt;br&gt;</code></a> elements.</li>
 <li>Fixed a bug that prevents justification from taking effect properly when applied to the first line in a <a href="/zh-TW/docs/Web/API/Element/contenteditable" title="The documentation about this has not yet been written; please consider contributing!"><code>element.contenteditable</code></a> area.</li>
 <li>Fixed a bug that caused pressing delete or backspace at the beginning of a <a href="/zh-TW/docs/Web/API/Element/contenteditable" title="The documentation about this has not yet been written; please consider contributing!"><code>element.contenteditable</code></a> area to affect the previous <code>contenteditable</code> block if one is present.</li>
 <li><a href="/zh-TW/docs/Web/API/Document/getSelection" title="The documentation about this has not yet been written; please consider contributing!"><code>document.getSelection()</code></a> now returns the same <code>Selection</code> object as <a href="/zh-TW/docs/Web/API/Window/getSelection" title="The documentation about this has not yet been written; please consider contributing!"><code>window.getSelection()</code></a>, instead of <em>stringifying</em> it.</li>
 <li>The HTML5 <code>selectionDirection</code> property makes it possible to define the direction of the selection in an editable text.</li>
 <li><a href="/zh-TW/docs/Web/API/HTMLMediaElement" title="The HTMLMediaElement interface adds to HTMLElement the properties and methods needed to support basic media-related capabilities that are common to audio and video."><code>HTMLMediaElement</code></a> now have a <code>seekable</code> property that return a <a href="/zh-TW/docs/Web/API/TimeRanges" title="The documentation about this has not yet been written; please consider contributing!"><code>TimeRanges</code></a> object.</li>
 <li>The <a href="/zh-TW/docs/Web/API/HTMLMediaElement" title="The HTMLMediaElement interface adds to HTMLElement the properties and methods needed to support basic media-related capabilities that are common to audio and video."><code>HTMLMediaElement</code></a><code>.preload</code> attribute now correctly reflects as an <em>enumerated value</em>.</li>
 <li><a href="/en/HTML/CORS_settings_attributes" title="en/HTML/CORS_settings_attributes"><code>crossOrigin</code> property</a> defaults to "Anonymous" when an invalid value is used.</li>
 <li><a href="/zh-TW/docs/Web/API/Window/navigator/cookieEnabled" title="The documentation about this has not yet been written; please consider contributing!"><code>window.navigator.cookieEnabled</code></a> now returns correct information when the default cookie setting is overridden on a per-site basis.</li>
</ul>

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

<ul>
 <li><code><a href="/en/JavaScript/Reference/Global_Objects/RegExp/exec" title="en/JavaScript/Reference/Global Objects/RegExp/exec">RegExp.exec()</a></code> and <code><a href="/en/JavaScript/Reference/Global_Objects/RegExp/test" title="en/JavaScript/Reference/Global Objects/RegExp/test">RegExp.test()</a></code> called with no arguments now match against the string "undefined".</li>
 <li><code><a href="/en/JavaScript/Reference/Global_Objects/String/search" title="en/JavaScript/Reference/Global Objects/String/search">String.search()</a></code> and <code><a href="/en/JavaScript/Reference/Global_Objects/String/match" title="en/JavaScript/Reference/Global Objects/String/match">String.match()</a></code> called with no arguments or <code>undefined</code> now match against the empty string and thus match every string.</li>
 <li>Support for watchlists has been implemented with the new (non-standard) <a href="/en/JavaScript/Reference/Global_Objects/Object/watch" title="en/JavaScript/Reference/Global_Objects/Object/watch"><code>watch()</code></a> and <a href="/en/JavaScript/Reference/Global_Objects/Object/unwatch" title="en/JavaScript/Reference/Global_Objects/Object/unwatch"><code>unwatch()</code></a> methods.</li>
</ul>

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

<ul>
 <li><a href="/zh-TW/docs/Web/CSS/resolution" title="The documentation about this has not yet been written; please consider contributing!"><code>resolution</code></a> now accepts <a href="/zh-TW/docs/Web/CSS/number" title="The documentation about this has not yet been written; please consider contributing!"><code>&lt;number&gt;</code></a>, not just <a href="/zh-TW/docs/Web/CSS/integer" title="The documentation about this has not yet been written; please consider contributing!"><code>&lt;integer&gt;</code></a> values as per the specification.</li>
 <li>Hyphenation rules have been added for many new languages when using <a href="/zh-TW/docs/Web/CSS/hyphens" title="The documentation about this has not yet been written; please consider contributing!"><code>hyphens</code></a>.</li>
 <li>Handling of <a href="/zh-TW/docs/Web/CSS/background-size" title="The documentation about this has not yet been written; please consider contributing!"><code>background-size</code></a> has been revised to more closely match the specification.</li>
 <li>In the past, <a href="/zh-TW/docs/Web/CSS/text-decoration" title="The documentation about this has not yet been written; please consider contributing!"><code>text-decoration</code></a> in quirks mode had line thickness and position adjusted on descendant text to match the descendant. Now standards mode and quirks mode rendering are more similar.</li>
 <li>Horizontal positioning for elements has been brought more in line with the specification in many cases. Documentation for this is forthcoming, but for now, see <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=682780" title="jig.com looks different in aurora vs. firefox">bug 682780</a>, comment 23 for details.</li>
 <li><a href="/en/CSS/Scaling_of_SVG_backgrounds" title="en/CSS/Scaling_of_SVG_backgrounds">SVG images are now scaled properly</a> when used as background images.</li>
</ul>

<h3 id="Network">Network</h3>

<ul>
 <li>Double quotes are no longer accepted as a delimiter for <a href="https://tools.ietf.org/html/rfc2231">RFC 2231</a> or <a href="https://tools.ietf.org/html/rfc5987">RFC 5987</a> encoding, as per those RFCs.</li>
 <li>MIME header field parser (<code>Content-Disposition</code>) now requires "=" in parameters.</li>
 <li>Scripts are no longer downloaded when JavaScript is disabled.</li>
 <li>SSL 2.0 is no longer supported.</li>
</ul>

<h3 id="WebSockets">WebSockets</h3>

<ul>
 <li>The <a href="/en/WebSockets/WebSockets_reference/WebSocket" title="WebSocket"><code>WebSocket</code></a> object's <a href="/en/WebSockets/WebSockets_reference/WebSocket#send()" title="en/WebSockets/WebSockets reference/WebSocket#send()"><code>send()</code></a> method no longer incorrectly returns a Boolean value.</li>
 <li>The <a href="/en/WebSockets/WebSockets_reference/WebSocket" title="WebSocket"><code>WebSocket</code></a> object's <a href="/en/WebSockets/WebSockets_reference/WebSocket#close()" title="en/WebSockets/WebSockets_reference/WebSocket#close()"><code>close()</code></a> method now matches the current draft of the standard, and close events now properly use the <a href="/en/WebSockets/WebSockets_reference/CloseEvent" title="CloseEvent"><code>CloseEvent</code></a> interface.</li>
 <li>The <a href="/en/WebSockets/WebSockets_reference/WebSocket" title="WebSocket"><code>WebSocket</code></a> object's <code>extensions</code> attribute is now supported.</li>
 <li>The WebSocket constructor now supports an array of protocols as well as a single protocol string.</li>
 <li>Mixed content is not allowed with WebSockets; that is, you can no longer open a connection to a non-secure WebSocket server from secure content.</li>
 <li>Connection errors with WebSockets now trigger the <code>onerror</code> handler.</li>
 <li><a href="/en/WebSockets" title="en/WebSockets">WebSocket</a> API has been updated to the latest draft of the specification (see <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=674890" title="FIXED: Update WebSocket API to latest draft - send() should return void">bug 674890</a>, <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=674527" title="FIXED: Update WebSocket API to latest draft - array of protocols in ctor">bug 674527</a>, and <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=674716" title="FIXED: Update WebSocket API to latest draft - close codes and reasons">bug 674716</a>).</li>
 <li>The deflate-stream extension to WebSockets has been disabled; it has been deprecated, and was breaking compatibility with some sites.</li>
</ul>

<h3 id="WebGL">WebGL</h3>

<ul>
 <li><a href="/en/WebGL/Cross-Domain_Textures" title="en/WebGL/Cross-Domain Textures">Cross-domain textures</a> can now be allowed with CORS approval.</li>
 <li>Cross-process rendering with Direct2D/Direct3D 10.</li>
</ul>

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

<ul>
 <li>Support for the <code>displaystyle</code> attribute on the top-level <code><a href="/zh-TW/docs/Web/MathML/Element/math" title="&lt;math>">&lt;math&gt;</a></code> element has been added.</li>
 <li>The interpretation of negative row numbers for the <code>align</code> attribute on <code><a href="/zh-TW/docs/Web/MathML/Element/mtable" title="&lt;mtable>">&lt;mtable&gt;</a></code> has been corrected.</li>
</ul>

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

<ul>
 <li>The <a href="/en/Tools/Web_Console#The_console_object" title="en/Using_the_Web_Console#The_console_object"><code>console</code></a> object has a new <code>dir()</code> method, which displays an interactive list of the properties on a specified object.</li>
</ul>

<h2 id="Changes_for_Mozilla_and_add-on_developers">Changes for Mozilla and add-on developers</h2>

<p>See <a href="/en/Firefox/Updating_add-ons_for_Firefox_8" title="en/Firefox/Updating_add-ons_for_Firefox_8">Updating add-ons for Firefox 8</a> for a guide to changes you're likely to have to make to make your add-ons compatible with Firefox 8.</p>

<div class="note"><strong>Note:</strong> Firefox 8 requires that binary components be recompiled, as do all major releases of Firefox. See <a href="/En/Developer_Guide/Interface_Compatibility#Binary_Interfaces" title="En/Developer_Guide/Interface_Compatibility#Binary_Interfaces">Binary Interfaces</a> for details.</div>

<h3 id="XPCOM">XPCOM</h3>

<dl>
 <dt><a href="/en/Components.utils" title="en/Components.utils"><code>Components.utils</code></a></dt>
 <dd>The new methods <a href="/en/Components.utils.createObjectIn" title="en/Components.utils.createObjectIn"><code>Components.utils.createObjectIn()</code></a> and <a href="/en/Components.utils.makeObjectPropsNormal" title="en/Components.utils.makeObjectPropsNormal"><code>Components.utils.makeObjectPropsNormal()</code></a> have been created to make it easier to create objects in specific compartments.</dd>
</dl>

<h4 id="Other_XPCOM_related_changes">Other XPCOM related changes</h4>

<ul>
 <li>You can now instantiate DOM <a href="/zh-TW/docs/Web/API/File" title="File 介面提供了檔案的資訊並且允許網頁中的 JavaScript 存取檔案的內容。"><code>File</code></a> objects from component code by simply doing new File, instead of having to instantiate an <code><a href="/zh-TW/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIDOMFile" title="">nsIDOMFile</a></code> directly.</li>
 <li>The <code>nsTPtrArray</code> array type has been removed. Its functionality is now all available on <code>nsTArray</code>, which now offers the <code>SafeElementAt()</code> method when instantiated using a pointer type. See the section on <a href="/en/XPCOM_array_guide#Bounds-safe_access_to_elements" title="en/XPCOM_array_guide#Bounds-safe_access_to_elements"><code>SafeElementAt()</code></a> in the <a href="/en/XPCOM_array_guide" title="XPCOM array guide">XPCOM array guide</a> for more information.</li>
</ul>

<h3 id="Workers">Workers</h3>

<p>It is no longer possible to access XPCOM objects from ChromeWorkers. XPConnect has been disabled in worker contexts as of <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=649537" title="FIXED: Workers: Make one OS thread and JS runtime per worker, and lose XPConnect">bug 649537</a>.</p>

<h3 id="XUL">XUL</h3>

<ul>
 <li>A bug in <a href="/zh-TW/docs/Web/API/Document/execCommand" title="当一个HTML文档切换到设计模式，文档对象会暴漏execCommand 方法，可以让用户运行命令操作可编辑区域的内容。大多指令作用于文档的选择（加粗，斜体等等），另外一些则是插入新元素（如添加一个链接）或者作用于一整行（如缩进）。当使用contentEditable 属性时，使用execCommand() 将会作用于当前激活的可编辑区域。"><code>document.execCommand()</code></a> that occurred when calling it on the value of <code><span><a href="https://developer.mozilla.org/zh-TW/docs/XUL/Property/contentDocument">contentDocument</a></span></code> has been fixed. Since Firefox 3, this resulted in errors instead of working correctly.</li>
 <li><a href="/en/Extensions/Bootstrapped_extensions" title="Bootstrapped extensions">Bootstrapped add-ons</a> can now load chrome using a <a href="/en/Chrome_Registration" title="en/chrome.manifest"><code>chrome.manifest</code></a> file. See the section <a href="/en/Extensions/Bootstrapped_extensions#Adding_user_interface_with_a_chrome.manifest" title="en/Extensions/Bootstrapped_extensions#Adding_user_interface_with_a_chrome.manifest">Adding user interface with a chrome.manifest</a> for details.</li>
 <li><a href="/en/XUL/image" title="en/XUL/image">XUL images</a> now shrink down with the same ratio in both directions when specifying maximum sizes.</li>
</ul>

<h3 id="Changes_to_the_build_system">Changes to the build system</h3>

<ul>
 <li>The following build configuration options have been removed:
  <ul>
   <li><code>--enable-timeline</code></li>
   <li><code>--disable-storage</code></li>
   <li><code>--necko-disk-cache</code></li>
  </ul>
 </li>
 <li>When compiling IDL files to headers, the header file <code>jspubtd.h</code> is automatically included when needed. Manual inclusions of <code>jspubtd.h</code> and/or <code>jsapi.h</code> in IDL files that use jsval or [implicit_jscontext] are no longer necessary.</li>
</ul>

<h3 id="Chrome_registration">Chrome registration</h3>

<ul>
 <li>The <a href="/en/Chrome_Registration#platformversion" title="en/Chrome_Registration#platformversion"><code>platformversion</code></a> flag can be used in the chrome.manifest to specify Gecko version compatibility.</li>
</ul>

<h3 id="Interface_changes">Interface changes</h3>

<ul>
 <li>The <code><a href="https://developer.mozilla.org/zh-TW/docs/XPCOM_Interface_Reference/mozIJSSubScriptLoader#loadSubScript()">mozIJSSubScriptLoader.loadSubScript()</a></code> method now loads scripts from the startup cache when possible.</li>
 <li>The <code>ownerWindow</code> attribute has been removed from the <code><a href="/zh-TW/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIAccessNode" title="">nsIAccessNode</a></code> interface.</li>
 <li>The <code><a href="/zh-TW/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIDOMStorageWindow" title="">nsIDOMStorageWindow</a></code> interface has been merged into the <code><a href="/zh-TW/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIDOMWindow" title="">nsIDOMWindow</a></code> interface.</li>
 <li>All members of the <code><a href="/zh-TW/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIDOMWindowInternal" title="">nsIDOMWindowInternal</a></code> interface have been moved into the <code><a href="/zh-TW/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIDOMWindow" title="">nsIDOMWindow</a></code> interface. The interface itself (with no members) remains available for compatibility until Firefox 9.</li>
 <li>In order to improve performance, callback handling for asynchronous Places database updates has been changed. See the new <code><a href="https://developer.mozilla.org/zh-TW/docs/XPCOM_Interface_Reference/mozIVisitInfoCallback#handleResult()">mozIVisitInfoCallback.handleResult()</a></code> and <code><a href="https://developer.mozilla.org/zh-TW/docs/XPCOM_Interface_Reference/mozIVisitInfoCallback#handleError()">mozIVisitInfoCallback.handleError()</a></code> methods, which replace the old single method for both error and success condition handling.</li>
 <li>The <code><a href="/zh-TW/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIMemoryReporter" title="">nsIMemoryReporter</a></code> <code>KIND_MAPPED</code> attribute has been deprecated in favor of <code>KIND_NONHEAP</code>, new unit types <code>UNITS_COUNT_CUMULATIVE</code> and <code>UNITS_PERCENTAGE</code> have been added.</li>
 <li>The <code><a href="/zh-TW/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIMemoryReporterManager" title="">nsIMemoryReporterManager</a></code> interface has a new <code>explicit</code> attribute, which reports the total size of explicit memory allocations.</li>
 <li>The <code><a href="/zh-TW/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIMemoryReporterManager" title="">nsIMemoryReporterManager</a></code> interface has a new <code>resident</code> attribute, which reports the amount of physical memory used.</li>
 <li>The <code><a href="/zh-TW/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsINetworkLinkService" title="">nsINetworkLinkService</a></code> interface has a new attribute, <code>linkType</code>. This attribute provides the type of network connection in use. All Operating Systems currently return <code>LINK_TYPE_UNKNOWN</code>. Android support was backed out due to perceived security concerns.</li>
 <li>The <code><a href="/zh-TW/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsISelection2" title="">nsISelection2</a></code> interface has been merged into the <code><a href="/zh-TW/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsISelectionPrivate" title="">nsISelectionPrivate</a></code> interface.</li>
 <li>The <code><a href="/zh-TW/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsISelection3" title="">nsISelection3</a></code> interface has been merged into the <code><a href="/zh-TW/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsISelection" title="">nsISelection</a></code> interface.</li>
 <li>The <code><a href="/zh-TW/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsISessionStartup" title="">nsISessionStartup</a></code> attribute state is now a <a href="/En/SpiderMonkey/JSAPI_Reference/Jsval" title="en/jsval"><code>jsval</code></a> instead of a string, for performance reasons.</li>
 <li>The <code><a href="/zh-TW/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIDocShell" title="">nsIDocShell</a></code> attribute <code>isActive</code> is now <code>false</code> for minimized windows.</li>
 <li>The <code><a href="https://developer.mozilla.org/zh-TW/docs/XPCOM_Interface_Reference/nsIDownloadHistory#addDownload()">nsIDownloadHistory.addDownload()</a></code> method now saves <span id="summary_alias_container"><span id="short_desc_nonedit_display">the the target where the download is saved on the local file system.</span></span></li>
</ul>

<h4 id="Removed_interfaces">Removed interfaces</h4>

<p>The following interfaces were implementation details that are no longer needed:</p>

<ul>
 <li><code>nsITimelineService</code></li>
 <li><code>nsIDOMHTMLIsIndexElement</code></li>
</ul>

<p>The <code><a href="/zh-TW/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIWorkerFactory" title="">nsIWorkerFactory</a></code> interface has been removed as well. Workers can still be created using the <code>Worker</code> and <code>ChromeWorker</code> constructors.</p>

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

<ul>
 <li>When a window is minimized, un-minimized, or switches between full screen and windowed mode, it receives a <code>sizemodechange</code> event.</li>
 <li>You can now <a href="/en/Installing_extensions#Preventing_automatic_install_from_specific_locations" title="en/Installing_extensions#Preventing_automatic_install_from_specific_locations">use the <code>extensions.autoDisableScopes</code> preference</a> to disable automatic installation of add-ons from specific add-on install locations.</li>
 <li>The new <a href="/zh-TW/docs/Web/API/Document/mozSyntheticDocument" title="The documentation about this has not yet been written; please consider contributing!"><code>document.mozSyntheticDocument</code></a> property on <a href="/zh-TW/docs/Web/API/Document" title="Document 介面代表所有在瀏覽器中載入的網頁，也是作為網頁內容 DOM 樹"><code>Document</code></a> objects lets you determine whether a document is synthetic (that is, something like a standalone image, video, or audio file) rather than a full, standard DOM document. This can be useful, for example, if you want to present different user interface in this situation (such as adding contextual items differently depending on this case).</li>
 <li>You can now specify a filter when opening <code>about:config</code>; for example, "about:config?filter=sessionstore" will show only session storage related preferences.</li>
</ul>

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

<ul>
 <li><a href="/en/Firefox_7_for_developers" title="en/Firefox_7_for_developers">Firefox 7 for developers</a></li>
 <li><a href="/en/Firefox_6_for_developers" title="en/Firefox_6_for_developers">Firefox 6 for developers</a></li>
 <li><a href="/en/Firefox_5_for_developers" title="en/Firefox_5_for_developers">Firefox 5 for developers </a></li>
 <li><a href="/en/Firefox_4_for_developers" title="en/Firefox_4_for_developers">Firefox 4 for developers </a></li>
 <li><a href="/en/Firefox_3.6_for_developers" title="en/Firefox_3.6_for_developers">Firefox 3.6 for developers </a></li>
 <li><a href="/En/Firefox_3.5_for_developers" title="En/Firefox_3.5_for_developers">Firefox 3.5 for developers</a></li>
 <li><a href="/en/Firefox_3_for_developers" title="en/Firefox_3_for_developers">Firefox 3 for developers</a></li>
 <li><a href="/en/Firefox_2_for_developers" title="en/Firefox_2_for_developers">Firefox 2 for developers</a></li>
 <li><a href="/en/Firefox_1.5_for_developers" title="en/Firefox_1.5_for_developers">Firefox 1.5 for developers</a></li>
</ul>