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+---
+title: Debugger (before Firefox 52)
+slug: Tools/Debugger_(before_Firefox_52)
+tags:
+  - NeedsTranslation
+  - TopicStub
+translation_of: Tools/Debugger_(before_Firefox_52)
+---
+<div>{{ToolsSidebar}}</div><div class="note">
+<p>This page describes the JavaScript Debugger as it appears before Firefox 52.</p>
+
+<p><a href="/en-US/docs/Tools/Debugger">See what it looks like from Firefox 52 onwards.</a></p>
+</div>
+
+<p>The JavaScript Debugger enables you to step through JavaScript code and examine or modify its state to help track down bugs.</p>
+
+<p>You can use it to debug code running locally in Firefox or running remotely, for example in a Firefox OS device or Firefox on Android. See <a href="/en-US/docs/Tools/Remote_Debugging">remote debugging </a>to learn how to connect the debugger to a remote target.</p>
+
+<p>{{EmbedYouTube("sK8KU8oiF8s")}}</p>
+
+<hr>
+<h2 id="User_Interface_Tour">User Interface Tour</h2>
+
+<p>To find your way around the debugger, here's a <a href="/en-US/docs/Tools/Debugger_(Before_Firefox_52)/UI_Tour">quick tour of the UI</a>.</p>
+
+<hr>
+<h2 id="How_to">How to</h2>
+
+<p>To find out what you can do with the debugger, see the following how-to guides:</p>
+
+<div class="twocolumns">
+<ul>
+ <li><a href="/en-US/docs/Tools/Debugger_(Before_Firefox_52)/How_to/Open_the_debugger">Open the debugger</a></li>
+ <li><a href="/en-US/docs/Tools/Debugger_(Before_Firefox_52)/How_to/Set_a_breakpoint">Set a breakpoint</a></li>
+ <li><a href="/en-US/docs/Tools/Debugger_(Before_Firefox_52)/How_to/Disable_breakpoints">Disable breakpoints</a></li>
+ <li><a href="/en-US/docs/Tools/Debugger_(Before_Firefox_52)/How_to/Step_through_code">Step through code</a></li>
+ <li><a href="/en-US/docs/Tools/Debugger_(Before_Firefox_52)/How_to/Break_on_a_DOM_event">Break on a DOM event</a></li>
+ <li><a href="/en-US/docs/Tools/Debugger_(Before_Firefox_52)/How_to/Highlight_and_inspect_DOM_nodes">Highlight and inspect DOM nodes</a></li>
+ <li><a href="/en-US/docs/Tools/Debugger_(Before_Firefox_52)/How_to/Pretty-print_a_minified_file">Pretty-print a minified file</a></li>
+ <li><a href="/en-US/docs/Tools/Debugger_(Before_Firefox_52)/How_to/Search_and_filter">Search and filter</a></li>
+ <li><a href="/en-US/docs/Tools/Debugger_(Before_Firefox_52)/How_to/Set_a_conditional_breakpoint">Set a conditional breakpoint</a></li>
+ <li><a href="/en-US/docs/Tools/Debugger_(Before_Firefox_52)/How_to/Examine,_modify,_and_watch_variables">Examine, modify, and watch variables</a></li>
+ <li><a href="/en-US/docs/Tools/Debugger_(Before_Firefox_52)/How_to/Use_a_source_map">Use a source map</a></li>
+ <li><a href="/en-US/docs/Tools/Debugger_(Before_Firefox_52)/How_to/Black_box_a_source">Black box a source</a></li>
+ <li><a href="/en-US/docs/Tools/Debugger_(Before_Firefox_52)/How_to/Debug_eval_sources">Debug eval sources</a></li>
+ <li><a href="/en-US/docs/Tools/Debugger_(Before_Firefox_52)/How_to/Access_debugging_in_add-ons">Access debugging in add-ons</a></li>
+</ul>
+</div>
+
+<hr>
+<h2 id="Reference">Reference</h2>
+
+<div class="twocolumns">
+<ul>
+ <li><a href="/en-US/docs/Tools/Debugger_(Before_Firefox_52)/Keyboard_shortcuts">Keyboard shortcuts</a></li>
+ <li><a href="/en-US/docs/Tools/Debugger_(Before_Firefox_52)/Settings">Settings</a></li>
+</ul>
+</div>