It goes well with Adelle, Inconsolata, Majesti Banner, Playfair Display, Montserrat, Arvo and PT Serif. If you're thinking about using Fira Sans then try
People commonly tag it as portfolio, design, simple, writing, food, agency, social, header, business and tech. You can get it from Font Squirrel, Google Web Fonts and Typekit.
Examples Fira Sans on its own
In action 8 Fira Sans samples
