If you still use FF, this won't stop you.
After all they have done to alienate their Original Base (OB ©), they know that if you haven't left by now, you'll never leave.
They have methodically transformed FF from being the king of customization to the 'my way or the highway' browser.
So if you're upset that they're going to be spamming you. Be upset with yourself for being too lazy to walk away when they were slowly shoving that furry tail plug up there. Now it's all the way in...