Back in June I worked on a desktop Firefox feature that would bundle the Emoji One font on Linux and Windows Firefox installs. By bundling the font (which converted to the right format for Gecko), Firefox users on Windows XP/7/8 and Linux can see color Emoji instead of blank tofu or black-and-white system default glyphs.
Today, this feature reaches release, on Firefox 50.
Special thanks to Jonathan Kew on helping me address the issues found in the Gecko graphics code and font format conversion. Enjoy and try it on your browser 😁😁😁!