Can you create a web page? Now you can create a plugin for Firefox too

Most people cannot create an extension to Firefox - this requires knowledge of Javascript, XUL, and some experience in XML. There are now about 8,000 developers and 12,000 plug-ins for Firefox, but Mozilla is always looking for ways to expand it.

So Mozilla has released the experimental program Jetpack , which allows anyone who can create a web page to create an add-on to Firefox. This means that for a simple add-on to a popular browser, you just need HTML knowledge. Jetpack also supports CSS and Javascript.

And for those of you who are not good at programming, Jetpack makes one very important change: you do not have to restart the browser in order to install the add-on through Jetpack.
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Jetpack is a very early open source project, it is only 0.1 version and there are a lot of bugs so far. But now it allows everyone to use the API to create statusbars, work with tabs and much more. It also supports an external API like Twitter, and you can create simple add-ons to tweet Firefox.

So, if you're a developer, see the video presentation on how to create add-ons for Firefox.