There are a lot of Firefox extensions. The Top 10 Firefox extensions are very useful to everyone and will not interfere with any of your web browsing experience. In fact, the extensions will enhance the experience by a lot. The Top 10 extensions include:
1. Customize Google
2. Gspace
3. Flashgot/DownThemAll
4. Greasemonkey + Stylish + Ad blocking per Gozer
5. Flashblock
6. Download Statusbar
7. URL Fixer
8. Tab Mix Plus
9. Scrapbook
10. IE Tab
http://www.lifehack.org/articles/productivity/top-10-firefox-extensions-to-improve-your-productivity.html
