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NOTE: This section is old and unncessecary since these patches are already contributed to Librewolf.

I tracked down the functions making devtools detection possible in the firefox source code and compiled a version which is undetectable by any of these tools.

Linux build: https://mega.nz/file/YSAESJzb#x036cCtphjj9kB-kP_EXReTTkF7L7xN8nKw6sQN7gig

Windows build: https://mega.nz/file/ZWAURAyA#qCrJ1BBxTLONHSTdE_boXMhvId-r0rk_kuPJWrPDiwg

Mac build: https://mega.nz/file/Df5CRJQS#azO61dpP0_xgR8k-MmHaU_ufBvbl8_DlYky46SNSI0s

about:config devtools.console.bypass disables the console which invalidates method 2.

about:config devtools.debugger.bypass completely disables the debugger, useful to bypass method 3.

If you want to compile firefox yourself with these bypasses you can, using the line changes below in the described files.

BUILD: 101.0a1 (2022-04-19) ./devtools/server/actors/thread.js At line 390

  attach(options) {
    let devtoolsBypass = Services.prefs.getBoolPref("devtools.debugger.bypass", true);
    if (devtoolsBypass)
        return;

./devtools/server/actors/webconsole/listeners/console-api.js At line 92

observe(message, topic) {
let devtoolsBypass = Services.prefs.getBoolPref("devtools.console.bypass", true);
if (!this.handler || devtoolsBypass) {
  return;
}

./browser/app/profile/firefox.js At line 23

// Bypasses
pref("devtools.console.bypass", true);
pref("devtools.debugger.bypass", true);