"Plenty of activity going on at Mozilla Labs these days. The
latest release out is an update to Jetpack 0.6 that adds two new
APIs, a slew of bugfixes, and a gallery of Jetpacks.
"A quick reminder, since Jetpack hasn't been around that long.
We covered Jetpack back in June, and it's improved quite a bit
since then. Jetpack is a way to extend Firefox using HTML,
browser chrome. As an added bonus, since Jetpacks don't get into
the "guts" of Firefox, installing a Jetpack doesn't even require a
restart of the browser (though the Jetpack extension itself does
"One of the big additions in 0.6 is the ability to easily create
menus. This means Jetpack developers can whip in a menu item to the
context menu or Firefox menus with minimal code."