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I have disabled signature checks in Firefox because otherwise it is impossible to install a private extension without uploading the source code to Mozilla.

This is how you allow unsigned extensions in Firefox on Arch Linux, the same files can be edited on Windows and macOS, restart the browser after changes:

  sudo tee /usr/lib/firefox/defaults/pref/config-prefs.js &>/dev/null <<EOF
  pref("general.config.obscure_value", 0);
  pref("general.config.filename", "config.js");
  pref("general.config.sandbox_enabled", false);

  sudo tee /usr/lib/firefox/config.js &>/dev/null <<EOF
  // keep this comment
  try {
      .import('resource://gre/modules/addons/XPIDatabase.jsm', {})
  } catch (ex) {

This method also works for the stable version of Firefox.

It's very good that it's possible, but it's literally the worst solution for most people.

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