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Firefox 52 introduces a new JavaScript Debugger with new UI but lack of many features that the old one has. One that I found critical and can't work without is the ability to search for some text in all files. So how can I get back the old debugger?

Hp93
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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 as explained on MDN.

Sebastian Zartner
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Hp93
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  • While that's true, the related preference will be removed in a future version of Firefox (hopefully when the new UI has feature parity with the old one). – Sebastian Zartner Jan 10 '17 at 10:49
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    Sadly, the preference no longer works (Firefox 68) and the new UI [does not have all of the features of the old Debugger](https://superuser.com/q/1469699/45163). – palswim May 22 '20 at 05:05