The Mozilla Labs team seems to be on afterburners as just four days after releasing JetPack 0.3, they have come up with the 0.4 version. JetPack is an API that enables people to enhance the Firefox browser by writing add-ons for it using web technologies like HTML, CSS and JavaScript.

JetPack 0.4 comes with two major additions - first there's the support for recording audio directly to Ogg-Vorbis. These audio encoding APIs allow developers to build Jetpacks that record high-quality audio directly from within the browser, which can then be played back using Firefox 3.5's new audio tag support. Second, we have the 'page mod' API, which enables devs to add features or functionality to any website being viewed in the browser.

Those interested can get JetPack 0.4 from this page.