Firefox has that simplified API in the Add-on SDK (aka Jetpack). However, they're stuck supporting all the traditiional XUL and XPCOM based extensions as well.

Firefox has that simplified API in the Add-on SDK (aka Jetpack). However, they're stuck supporting all the traditiional XUL and XPCOM based extensions as well. https://addons.mozilla.org/en-US/developers/tools/builder https://addons.mozilla.org/en-US/developers/tools/builder