The file
The orange M&M was invented for this: the crispy one, a rice-crisp center that made the candy lighter and louder. It launched in 1999 and was gone in the U.S. by 2005 while the rest of the world kept it.
The revival is the model for the genre: a decade of complaints, a Facebook campaign, and a 2015 return announced by Mars as a direct answer to fans. They've stayed.
Back since 2015. The orange one is still nervous in the ads.
Sources: Wikipedia — M&M's