Today Mozilla announced some big changes to its extension support. Their new addon API, WebExtensions, is mostly compatible with the extension model used by Chrome and Opera. In short, this means we'll soon see cross-platform browser extensions. They say, "For some time we've heard from add-on developers that our APIs could be better documented and easier to use. In addition, we've noticed that many Firefox add-on developers also maintain a Chrome, Safari, or Opera extension with similar functionality. We would like add-on development to be more like Web development: the same code should run in multiple browsers according to behavior set by standards, with comprehensive documentation available from multiple vendors."

http://news.slashdot.org/story/15/08...ome-extensions