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---
title: Settings
slug: Tools/Settings
translation_of: Tools/Settings
---
<div>{{ToolsSidebar}}</div><h2 id="Opening_Settings">Opening Settings</h2>
<p>To see the Developer Tools Settings pane, open any of the Developer Tools, and then:</p>
<ul>
<li>either click the "Settings" button (<img alt="" src="https://mdn.mozillademos.org/files/13158/settings-icon.png" style="display: inline-block; height: 25px; margin-bottom: -7px; width: 24px;">) in the Toolbox toolbar:<img alt="" src="https://mdn.mozillademos.org/files/13176/settings-show-icon.png" style="display: block; height: 632px; margin-left: auto; margin-right: auto; width: 890px;"></li>
<li>or press <kbd>F1</kbd> (new in Firefox 43) to toggle between the active tool and the Settings pane</li>
<li>or press <kbd>Ctrl/Cmd</kbd>+<kbd>Shift</kbd>+<kbd>O</kbd> to toggle between the active tool and the Settings pane</li>
</ul>
<p>The Settings pane looks something like this:</p>
<p><img alt="Depicts the Toolbox options" src="https://mdn.mozillademos.org/files/14506/devtools-settings.png" style="display: block; height: 1970px; margin-left: auto; margin-right: auto; width: 852px;"></p>
<h2 id="Categories">Categories</h2>
<h3 id="Default_Firefox_Developer_Tools">Default Firefox Developer Tools</h3>
<p>This group of checkboxes determines which tools are enabled in the toolbox. New tools are often included in Firefox but not enabled by default.</p>
<h3 id="Available_Toolbox_Buttons">Available Toolbox Buttons</h3>
<p>This group of checkboxes determines which tools get <a href="https://developer.mozilla.org/en-US/docs/Tools/Tools_Toolbox#Extra_tools">an icon in the Toolbox's toolbar</a>.</p>
<p>Note that in Firefox 52 we removed the checkbox to toggle the <a href="/en-US/docs/Tools/Page_Inspector/UI_Tour#Select_element_button">"Select element" button</a>. The "Select element" button is now always shown.</p>
<h3 id="Choose_DevTools_theme">Choose DevTools theme</h3>
<p>This enables you to choose one of three different themes.</p>
<p>There's a light theme, which is the default:</p>
<p><img alt="Light theme for DevTools" src="https://mdn.mozillademos.org/files/13172/theme-light-shadowed.png" style="display: block; height: 317px; margin-left: auto; margin-right: auto; width: 890px;"></p>
<p>A dark theme (the default on <a href="/en-US/docs/Mozilla/Firefox/Developer_Edition">Firefox Developer Edition</a>):</p>
<p><img alt="Dark theme for DevTools" src="https://mdn.mozillademos.org/files/13168/theme-dark.png" style="display: block; height: 306px; margin-left: auto; margin-right: auto; width: 875px;"></p>
<p class="geckoVersionNote">New in Firefox 48</p>
<p>There's also a Firebug theme that looks like the <a href="https://getfirebug.com/">Firebug extension</a>, letting you feel at home if you're used to Firebug:</p>
<p><img alt="Firebug theme for DevTools" src="https://mdn.mozillademos.org/files/13170/theme-firebug-shadowed.png" style="display: block; height: 318px; margin-left: auto; margin-right: auto; width: 890px;"></p>
<h3 id="Common_preferences">Common preferences</h3>
<p>Settings that apply to more than one tool. There's just one of these:</p>
<dl>
<dt><em>Enable persistent logs</em></dt>
<dd>A setting to control whether or not the Web Console and Network Monitor clear their output when you navigate to a new page.</dd>
</dl>
<h3 id="Inspector">Inspector</h3>
<dl>
<dt><em>Show browser styles</em></dt>
<dd>A setting to control whether styles applied by the browser (<a href="/en-US/docs/Web/CSS/Cascade">user-agent styles</a>) should be displayed in the Inspector's <a href="/en-US/docs/Tools/Page_Inspector/How_to/Examine_and_edit_CSS#Examine_CSS_rules">Rules view</a>. Note that this setting is independent of the "Browser styles" checkbox in the Inspector's <a href="/en-US/docs/Tools/Page_Inspector/How_to/Examine_and_edit_CSS#Examine_computed_CSS">Computed view</a>.</dd>
<dt><em>Truncate DOM attributes</em> (new in Firefox 47)</dt>
<dd>By default, the Inspector truncates DOM attributes that are more than 120 characters long. Uncheck this box to prevent this behavior. This setting works by toggling the about:config preference "devtools.markup.collapseAttributes". To change the threshold at which attributes are truncated, you can edit the about:config preference "devtools.markup.collapseAttributeLength".</dd>
<dt><em>Default color unit</em></dt>
<dd>A setting to control how colors are represented in the inspector:
<ul>
<li>Hex</li>
<li>HSL(A)</li>
<li>RGB(A)</li>
<li>color name</li>
<li>As authored (new in Firefox 44).</li>
</ul>
</dd>
</dl>
<h3 id="Web_Console">Web Console</h3>
<dl>
<dt><em>Enable timestamps</em></dt>
<dd>Controls whether the Web Console displays timestamps. The Web Console defaults to hiding timestamps.</dd>
</dl>
<h3 id="Style_Editor">Style Editor</h3>
<dl>
<dt><em>Show original sources</em></dt>
<dd>When a CSS preprocessor supporting source maps is used, this enables the Style Editor to display the original, preprocessor, sources rather than the generated CSS. <a href="/en-US/docs/Tools/Style_Editor#Source_map_support">Learn more about Style Editor support for CSS source maps</a>. With this setting checked, the <a href="/en-US/docs/Tools/Page_Inspector/How_to/Examine_and_edit_CSS#Link_to_CSS_file">Page Inspector Rules view will also provide links to the original sources</a>.</dd>
<dt><em>Autocomplete CSS</em></dt>
<dd>Enable the Style Editor to offer autocomplete suggestions.</dd>
</dl>
<h3 id="JavaScript_Profiler">JavaScript Profiler</h3>
<dl>
<dt><em>Show Gecko platform data</em></dt>
<dd>A setting to control whether or not profiles should include Gecko platform symbols.</dd>
</dl>
<h3 id="Editor_Preferences">Editor Preferences</h3>
<p>Preferences for the <a href="http://codemirror.net/">CodeMirror</a> source editor, which is included in Firefox and used by several developer tools, including <a href="/en-US/docs/Tools/Scratchpad">Scratchpad</a> and the <a href="/en-US/docs/Tools/Style_Editor">Style Editor</a>.</p>
<dl>
<dt><em>Detect indentation</em></dt>
<dd>Auto-indent new lines based on the current indentation.</dd>
<dt><em>Autoclose brackets</em></dt>
<dt> </dt>
<dt><em>Indent using spaces</em></dt>
<dt> </dt>
<dt><em>Tab size</em></dt>
<dt> </dt>
<dt><em>Keybindings</em></dt>
<dd>Choose the default CodeMirror keybindings, or keybindings from one of several popular editors:
<ul>
<li>Vim</li>
<li>Emacs</li>
<li>Sublime Text</li>
</ul>
</dd>
</dl>
<h3 id="Advanced_settings">Advanced settings</h3>
<dl>
<dt><em>Disable HTTP Cache</em></dt>
<dd>Disable the browser HTTP cache to simulate first-load performance in all tabs that have the Toolbox open. This setting persists, meaning that if it is set, caching will be disabled whenever you reopen the devtools. Caching is re-enabled when the devtools are closed. Note that service workers are not affected by this option.
<div class="note">Note that this option was called "Disable Cache" in Firefox versions previous to 49, but it was renamed to make it clearer that this affects the HTTP cache, and not <a href="/en-US/docs/Web/API/Service_Worker_API">Service Workers</a>/the <a href="/en-US/docs/Web/API/Cache">Cache API</a>.</div>
</dd>
<dt><em>Disable JavaScript</em></dt>
<dd>Reload the current tab with JavaScript disabled.</dd>
<dt><em>Enable Service Workers over HTTP</em></dt>
<dd>Enable Service Worker registrations from insecure websites.</dd>
<dt><em>Enable browser chrome and add-on debugging toolboxes</em></dt>
<dd>Enable you to use developer tools in the context of the browser itself, and not only web content.</dd>
<dt><em>Enable remote debugging</em></dt>
<dd>Enable the developer tools to <a href="/en-US/docs/Tools/Remote_Debugging">debug remote Firefox instances</a>.</dd>
</dl>
|
