Good advice. I just figured this out on my own, and thought it was reasonably easy enough. (You can also fiddle in about:config or click on the hamburger menu in about:home)
Switch to a privacy-friendly search engine like DuckDuckGo while you're at it.
- Options -> Home -> Firefox Home Content -> Uncheck everything
I personally leave "Web Search" enabled, which gives a Chrome-like/minimalist experience.