My Top 5 Add-Ons for Firefox 4

1. Adblock Plus 1.3.5  https://addons.mozilla.org/en-US/firefox/addon/adblock-plus/  "Adblock Plus allows you to regain control of the internet and view the web the way you want to. The add-on is supported by over forty filter subscriptions in dozens of languages which automatically configure it for purposes ranging from removing online advertising to blocking all known malware domains. Adblock Plus also allows you to customize your filters with the assistance of a variety of useful features, including a context option for images, a block tab for Flash and Java objects, and a list of blockable items to remove scripts and stylesheets."
2. Personal Menu (Personal Firefox Button) 5.0.1  https://addons.mozilla.org/en-US/firefox/addon/personal-menu/  "Now you can edit the Firefox Menu and change it to your personal and powerful one! Personal Menu provides you a couple of new helpful items that available to be put into Firefox Menu: Bookmark Items, History Items, Configuration(about:config), Restart. In addition, you may create toolbar-box (let you put toolbar-buttons inside), sub-menus and split-menus to organize your Firefox Menu!"  I use this to place it's own Bookmarks and  History buttons/icons on my Navigation Toolbar which I then customized to open each as a drop-down menu with click/left-click, a sidebar menu with right-click or a full screen "All Bookmarks"/"All History" with a middle-click!
3. Answers 2.3.54  https://addons.mozilla.org/en-US/firefox/addon/answers/  "Answers.com provides reliable facts and definitions from over 100 dictionaries, encyclopedias and almanacs without having to search through lists of search engine links. To use: * Just alt+click on any word or term in Firefox, no selection is necessary. * ctrl+alt+click to open answer in new tab, shift+alt+click to open in new window. * Select text and choose "Search Answers.com" from the context menu. * Also includes an optional Answers.com sidebar."
4. Shareaholic 2.2.0  https://addons.mozilla.org/en-US/firefox/addon/shareaholic-share-links-with-g/  "Share links from within the browser, from any webpage, with anyone, using the same services you already know and love like Facebook, Twitter, Gmail, Evernote, Delicious, Digg, Bit.ly/tinyURL, Amazon, Yahoo, your favourite Blog Sites and more from one simple all-in-one browser add-on."
5. Nuvola FF 1.9.9 (theme)  https://addons.mozilla.org/en-US/firefox/addon/nuvola-ff/