This is maybe a bit unrelated, but it's really pretty heartwarming to see things, however small, that are Firefox-only or Firefox-first. Sure, yes, Chrome is the wildly more popular browser (and Webkit-derived browsers are essentially everything that isn't FF), but a thousand tiny cuts like this are how we break out of the browser monoculture.

Having everything be Chrome-first (and, often, Chrome-only) is how we got here in the first place. <3 to the OP for focusing on Firefox first, and putting a pebble on the right side of the scale!