Unfortunately this is not possible ATM. However, in a few months you will be able to edit the tiles on the home page.

Really Mozilla?! Are you kidding me? I have used Firefox for years as my default browser precisely BECAUSE it allowed me to easily customize it to suit my personal needs and preferences and did not try to shove someone else's design decisions down my throat. Now I'm given no option to change the ridiculous "Awful" page to something else...ANYTHING else, for God's sake! Looks like Mozilla is drinking the same kool-aid as Mark Shuttleworth. I am very disappointed. Oh well...back to Chrome.

yes the Firefox for android homepage is hideous and nothing on it is relevant

You can fake it by following these directions https://support.mozilla.org/en-US/questions/950223