Why does Firefox have such poor responsive image support?

Based on my research of a less than an hour, there are three ways to approach responsive image support:

• What Chris Coyier recommended last year: “If you’re just changing resolutions, use srcset.”
• Use the picture element (but Chris warns, “…if you go down the <picture> with explicit sources, the browser has to do exactly what you say and not make choices for itself”).
• Use a polyfill (Chris recommends Picturefill—with a caveat: “To Picturefill, or not to Picturefill”).

So, yeah, my information is from last year. However, the srcset page from today’s caniuse.com is still telling a bleak story of corporate-sponsored “innovation.” Try out srcset with my Code Pen:

https://github.com/BryanWilhite/