I've been working on a few Firefox extensions for various third-parties, and two of them got upgrades this week:

• GreatSummary: A handy webpage summarization tool. Long Wikipedia articles are no match for this bad boy.
• Coupon Craze - Coupon Notifier: Sits in your status bar and lights up when there are coupon codes for the website you're visiting. (I saved 15% on printer ink with this while I was testing it.) Also, I'd have to say that Christian at CouponCraze.com is the most efficient client I've ever worked with: the time from the initial inquiry about working together to uploading the first version of the extension to Mozilla Addons was less than 48 hours. Verily I say to you, it rocked.