Google have published a design document for adding extensions to Google Chrome.
It's pretty comprehensive, and even exceeds Firefox's extension system in a few areas:
We should not need to disable deployed extensions when we release new versions of Chromium.
Unfortunately it's fairly obvious that the extension feature is at a very early stage, so we probably won't see it for a long time - at least months away.
EDIT: Google have published a new Extension Process Model document with some more details about how it's going to work - interesting reading

![Reblog this post [with Zemanta]](http://img.zemanta.com/reblog_c.png?x-id=ab117438-d8da-4ea4-864e-dec10c1c0463)