Recommanded Firefox Add-ons

Adblock Plus - Block ads and banners.
Add Bookmark Here - Add a menuitem "Add Bookmark Here..." to Bookmarks Menu.
Adsense Notifier - Displays your Adsense earnings on the statusbar.
Close All Tabs - A Toolbar Button To Close All Open Tabs
Colorful Tabs - Colors every tab in a different color and makes them easy to distinguish while beautifying the overall appearance of the interface.
Fasterfox - performance and network tweaks for Firefox.
Firebug - Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse.
Firefox Extension Backup Extension (FEBE) - backup your Firefox extensions.
LinkChecker - Check the validity of links on any webpage.
NoScript - A preemptive approach prevents exploitation of security vulnerabilities (known and even unknown!) with no loss of functionality.
Tab Mix Plus - Tab Mix Plus enhances Firefox's tab browsing capabilities.
Viamatic foXpose - Click on the icon in the status bar to view all the browser windows with a single click.
Minimize To Tray Enhancer - Adds extra needed features to MinimizeToTray