This is no longer needed because firefox 121 introduced an option to disable the debugger statement: https://www.mozilla.org/en-US/firefox/121.0/releasenotes/#note-789917

{Anti {{Anti Debugging} Debugger}} Firefox

The Firefox build that evades JavaScript anti-debugging debugger mechanisms.

Introduction

This repository provides GitHub Workflows to build Firefox browsers that replace the JavaScript debugger with custom keywords. This bypasses the debugProtection used by websites like weread and mycloud to secure their JavaScript code. Using these browser builds, developers can debug protected code without debugProtection constraints. The default keyword is debugger[%Y%m%d%H%M%S], where [%Y%m%d%H%M%S] is a build-time timestamp, e.g., 20230427040458. The workflow also allows for the customization of the debugger keyword.

Download & Install

You can download the Firefox installer from Github Actions artifacts (look for firefox-artifacts), or from the releases.

References

Evading JavaScript Anti-Debugging Mechanisms by nullptrs