You don't need to have a graphical Web browser installed on your Linux computer to download the Firefox Web browser. You can use the terminal, or command line ...
You're most likely using Safari on your iPad because it's the default browser and it's fully hooked into the iOS operating system, but it's not your only option ...
The new feature means Firefox will download updates in the background, apply them, and switch to the latest the next time the browser starts up. This effectively eliminates the “Firefox Update” dialog ...