I don't know how many times already I've had to remove this, and now nothing seems to work anymore. Setting browser.newtabpage.activity-stream.newtabLayouts.variant-b to false should work, I guess, but it doesn't.
Edit: shishka_b0b has posted a solution (as for enlarging the quick link icons, I forgot the simplest solution - zooming in the page)
I mean the default new tab, with the logo, search bar (which I removed because I can just search from the URL bar), and the quick links that automatically get populated with your most visited sites.
Btw an another user posted a solution, turns out removing it through CSS isn't that complicated (when a stranger provides you with the code, at least).