Aren’t Gamma-Rays impossible to stop even with lead? You can only weaken them.

Another W for Signal

Librewolf or debloating user.js?

Can only guess, but nixpkgs says the package provided is org.gnome.decibels not decibels. Maybe try this command

It is called pkgs.decibels. Should be feasible if you just did

  environment.gnome.excludePackages = [
    pkgs.decibels
  ];

Most scam apps are in the Google Play Store btw