Usually this is the main reason and I had to do the same for librewolf. And if I am not mistaken if you are hardening FF you need to make sure you are not blocking native messaging capabilities, IIRC flatpaks might also have similar “issues”.
Usually this is the main reason and I had to do the same for librewolf. And if I am not mistaken if you are hardening FF you need to make sure you are not blocking native messaging capabilities, IIRC flatpaks might also have similar “issues”.