Have any other browsers announced their intent to do the same?
"It includes, among others, certificate authorities used by the Debian infrastructure and those shipped with Mozilla's browsers. "
RE: OSX - If you can get into Mozilla's trust stores, it's the same steps (and pro forma, more or less) [1]
[0] https://packages.debian.org/wheezy/ca-certificates
[1] https://www.apple.com/certificateauthority/ca_program.html