From Lifehacker: Bookmarklets: Ditch Your Extensions for Bookmarklets.
This is something I’ve been doing more and more of recently, mainly because I don’t have a separate Firefox extension for everything blog or web 2.0 site that I use. I’ve also ditched the delicious.com extension in favor of bookmarklets that post to two of my own blogs.
There’s a side benefit to this strategy: You can switch web browsers and not have to worry about your extensions not being offered in the new browser (i.e., Google Chrome).