Mozilla: The Future of Developing Firefox Add-ons
Mozilla has announced
a significant set of changes for authors of Firefox add-ons. These include
a new API (and the deprecation of XUL and XPCOM), a process-based
sandboxing mechanism, mandatory signing of extensions, and more.
"For our add-on development community, these changes will bring
benefits, like greater cross-browser add-on compatibility, but will also
require redevelopment of a number of existing add-ons. We’re making a big
investment by expanding the team of engineers, add-on reviewers, and
evangelists who work on add-ons and support the community that develops
them. They will work with the community to improve and finalize the
WebExtensions API, and will help developers of unsupported add-ons make the
transition to newer APIs and multi-process support."