This is kind of a non-sequitur; at this point, we haven't even mentioned the "first" benchmark.

I'd say something like (as a new paragraph)

> Are we Slim Yet? originally tested only desktop Linux-64 Firefox builds.  But in late 2012 [ed. not early 2013?  That's when it appeared online...], AWSY started tracking memory usage of Firefox for Android (ARM) as well.