FireFox add-ons and Google services

How does your FireFox look like? How many Google services are you using? I pick up some Firefox toolbars, add-ons, Google services which I usually use. Common things for these stuffs: 3F (fun, fast, free), convenient and helpful.

(1) Google Reader: Subscribe feeds from any interested website. Make information goes to you in 1 place instead of looking for information in many places.
(2) Delicious bookmarks: Bookmark, share and access your bookmarked websites in 1 click. No matter wherever you are, your bookmarks are in 1 place, ready to access.
(3) Google toolbar: to google "anything". Where is my team member? Where did I put my key, mobile phone? :D
(4) Save webpage as PDF for offline review
(5) Stumble: randomly choose website as per your interests
(6) Proxy toolbar: bypass firewall to access to webpage you want
(7) Google notebook: take note whenever you see any interesting thing on nets: nice pictures, quotes, pop-up ideas. Notes are kepts with URL so that you can access later. I'm comparing this with Evernote to see which one is better.
(8) FF add-on multi-language dictionary

Many more things like: IE tab, Flashgot, Slideshare, Wiki, Google Map, Google gadgets, ... The fact is that there are abundant of 3F web2.0 services out there to increase users' productivity. Thing left is choosing the best ones and applying them to our working and studying.