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Sylvestre Ledru befdb44d3c Bug 2060007 - Add the missing toctree entries for orphaned documentation pages. r=necko-reviewers,devtools-reviewers,jdescottes,nchevobbe,valentin

220 pages built but were not reachable from any toctree, so they were
missing from the navigation entirely.

./mach doc goes from 905 to 683 warnings. The 3 remaining orphans are
under testing/perfdocs/generated, which is generated by
'./mach lint -l perfdocs' and should be fixed in the generator.

Differential Revision: https://phabricator.services.mozilla.com/D315857

2026-08-04 17:48:57 +00:00

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The Firefox JavaScript Debugger

The JavaScript Debugger enables you to step through JavaScript code and examine or modify its state to help track down bugs.

<iframe width="560" height="315" src="https://www.youtube.com/embed/QK4hKWmJVLo" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
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You can use it to debug code running locally in Firefox or running remotely, for example on an Android device running Firefox for Android. See {doc}about debugging <../about_colon_debugging/index> to learn how to connect the debugger to a remote target.

To find your way around the debugger, here's a {doc}quick tour of the UI<ui_tour/index>.

How to

To find out what you can do with the debugger, refer to the following how-to guides.

{doc}Open the debugger <how_to/open_the_debugger/index>
{doc}Pretty-print a minified file <how_to/pretty-print_a_minified_file/index>
{doc}Search <how_to/search/index>
{doc}Use a source map <how_to/use_a_source_map/index>
Debug worker threads

Pause execution

You probably want to pause the execution of your code, in order to see what is going on at various points. There are multiple ways to tell the Debugger how and when to pause:

{doc}Set a breakpoint <how_to/set_a_breakpoint/index>
{doc}Set a conditional breakpoint <how_to/set_a_conditional_breakpoint/index>
{doc}Set an XHR breakpoint <set_an_xhr_breakpoint/index>
{doc}Set event listener <set_event_listener_breakpoints/index>
{doc}Break on exceptions <how_to/breaking_on_exceptions/index>
{doc}Use watchpoints for property reads and writes <how_to/use_watchpoints/index>
{doc}Break on DOM Mutation <break_on_dom_mutation/index>
{doc}Disable breakpoints <how_to/disable_breakpoints/index>

Control execution

What can you do after execution pauses?

{doc}Step through code <how_to/step_through_code/index>
{doc}Ignoring sources <how_to/ignoring_sources/index>
Debug worker threads
{doc}Debug eval sources <how_to/debug_eval_sources/index>

Look at values

You probably want to see the value of variables or expressions, either during execution or when it is paused.

{doc}Set a logpoint <set_a_logpoint/index>
{doc}Set watch expressions <how_to/set_watch_expressions/index>

Reference

{ref}Keyboard shortcuts <keyboard-shortcuts-debugger>
{doc}Source map errors <source_map_errors/index>

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:maxdepth: 1

break_on_dom_mutation/index
how_to/index
set_a_logpoint/index
set_an_xhr_breakpoint/index
set_event_listener_breakpoints/index
source_map_errors/index
ui_tour/index
using_the_debugger_map_scopes_feature/index

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