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Re:Fira Sans: a Free, Open Source Typeface Commissioned by M... by grayclhn on Sunday May 25, 2014 @02:14AM (#7795645)
I like

    \usepackage[osf]{sourcecodepro}
It might be idiosyncratic preferences, but I like the height variation in monospace letters.

You might also want to use

    \DisableLigatures{family = tt*}
from the microtype package. It doesn't normally matter, but the sourcecodepro package has an "fl" ligature that's usually unwelcome.
Re:Fira Sans: a Free, Open Source Typeface Commissioned by M... by edwintorok on Sunday May 25, 2014 @03:34AM (#7795757)
Thanks, I'll use the \DisableLigatures. I actually don't like old-style numbers (see the [lf] option for Fira), but its a matter of personal preference.