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This page describes the JavaScript Debugger as it appears in Firefox 52 and above. To see what it's like in earlier versions of Firefox, see Debugger (before Firefox 52).

If you're using Firefox 52 or later and need to switch back to the old Debugger, you can do so by visiting about:config and setting the "devtools.debugger.new-debugger-frontend" preference to false.

Searching for files

To search for a particular file, press Control + P (or Command + P on a Mac) and type the search term. The source pane will display a list of all matching files as you type. You can use the up and down arrows to move through the list, and Return to open the file you want:

Searching within a file

To search for a particular substring in the file currently loaded into the source pane, press Control + F (or Command + F on a Mac) while the source pane is focused. Press Return to search. The debugger will highlight all matches:

Document Tags and Contributors

 Contributors to this page: wbamberg
 Last updated by: wbamberg,