Okay, people say this. Could you please, and this is not a rhetorical device, it's a sincere question: how do you keep the browser updated without updating the operating system? Or if you are updating the os, doesn't that change the user interface? And if the user interface is changing, doesn't that confuse your grandmother? I installed Ubuntu for my mom and after four years Firefox was out of date, and the website for banking she'd use would have checks where logging in was only possible if the one if the user agent was recent enough. One can fake that, but I didn't want to. But updating Firefox meant updating Ubuntu, which means that every single icon and every single menu position changes, and I didn't want to have to teach her where everything was again. How do you avoid this?