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diff --git a/devtools/docs/user/debugger/how_to/breaking_on_exceptions/index.rst b/devtools/docs/user/debugger/how_to/breaking_on_exceptions/index.rst new file mode 100644 index 0000000000..56a5de4335 --- /dev/null +++ b/devtools/docs/user/debugger/how_to/breaking_on_exceptions/index.rst @@ -0,0 +1,20 @@ +====================== +Breaking on exceptions +====================== + +To instruct the debugger to pause on an `exception <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error>`_, tick these checkboxes in the :ref:`Breakpoints list <debugger-ui-tour-breakpoints-list>`: + + +- Pause on exceptions +- Pause on caught exceptions + + +.. image:: version64ui.png + :alt: Screen shot showing "Pause on exceptions + :class: center + +When an exception occurs, the line where it occurs is highlighted in the source pane, with a squiggly red line under the problematic code. A tooltip describes the exception. Starting in Firefox 80, a disclosure triangle within the tooltip reveals a stack trace. + +.. image:: exception-tooltip-stacktrace.png + :alt: Screenshot of a tooltip for an exception + :class: center |