Madhava has a post up demonstrating a successful extension install in Fennec. Add-ons are as central to the idea of Fennec as they are to desktop Firefox, so this is great to see: prolific add-on author Chris Finke has added Fennec compatibility to his addon URL Fixer.

From an interface perspective, this chunk of Fennec is still a work in progress (see some design wireframes here); what you see in alpha 1 is more or less straight out of desktop Firefox. Still, it gets the job done, which means that we can walk through the process:

Glue is a browser add-on for people who consume movies, books and music online. It keeps track of what you're browsing on sites like Amazon and IMDB, and lets you enter your comments about each item you're browsing, and see what your friends thought about it. The name "Glue" makes a lot of sense, because it sticks together info from multiple sites for each product. If a friend reviewed a movie on Amazon, and you're looking at it on Rotten Tomatoes, you'll still be able to see their comments.

Reframe It adds a collapsible margin to your browser where you can comment on any text or image found on the web. All Reframe It members are part of a free online community where we encourage you to share your thoughts and ideas across the web.

Google Reader is a great service, but it would be nice to know when you have new unread items as opposed to always going to the tab, or being disappointed to find out it's only your least favorite feed that’s been updated. There are numerous Firefox extensions that can help you with these issues, and even help you to continue the discussion on the original blog depending on the commenting system they have installed.
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You smile when you see something pleasing. You smile when you are happy that you got your work done in a quick and efficient manner.  Here’s listing 10 Mozilla Firefox 3 plugins which do exactly that!