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+---
+title: Debugging Firefox Desktop
+slug: Tools/Remote_Debugging/Debugging_Firefox_Desktop
+translation_of: Tools/Remote_Debugging/Debugging_Firefox_Desktop
+---
+<p>{{draft}}</p>
+
+<p>{{ToolsSidebar}}</p>
+
+<p>This guide explains how you can use the Firefox Developer Tools to debug a different instance of desktop Firefox running on the same machine. In this guide, the instance of Firefox being debugged is called the <em>debuggee</em>, and the instance of Firefox doing the debugging is called the <em>debugger</em>.</p>
+
+<h2 id="Enable_remote_debugging">Enable remote debugging</h2>
+
+<p>First, you'll need to ensure that both debugger and debuggee have the "Enable browser chrome and add-on debugging toolboxes" and "Enable remote debugging" settings checked in the <a href="/en-US/docs/Tools/Tools_Toolbox#Settings">Developer Tools Settings</a>. If you're using <a href="/en-US/Firefox/Developer_Edition">Firefox Developer Edition</a>, they are checked by default.</p>
+
+<p><img alt="" src="https://mdn.mozillademos.org/files/16905/remote_debug_settings.png" style="border: 1px solid black; display: block; margin: 0 auto;"></p>
+
+<p>You only need to do this once: the setting values persist across restarts.</p>
+
+<h2 id="Start_the_debugger_server">Start the debugger server</h2>
+
+<p>Next, you need to start the debugger server in the debuggee.</p>
+
+<p>Run the debuggee from the command line, passing it the <code>--start-debugger-server</code> option:</p>
+
+<pre class="notranslate">/path/to/firefox --start-debugger-server</pre>
+
+<p>Passed with no arguments, --start-debugger-server makes the debugger server listen on port 6000. To use a different port, pass the desired port number:</p>
+
+<pre class="notranslate">/path/to/firefox --start-debugger-server 1234</pre>
+
+<p>Note: in Windows, the <code>start-debugger-server</code> call will only have one dash:</p>
+
+<pre class="notranslate">firefox.exe -start-debugger-server 1234</pre>
+
+<div class="note">
+<p><strong>Note</strong>: By default, and for security reasons, the <code>devtools.debugger.force-local</code> option is set. If you want to debug a Firefox instance from an external machine, you can change this option, but only do this on a trusted network or set a strong firewall rule to lock down which machines can access it.</p>
+</div>