Firefox - Addons

Use "Siphon" to sync addons across different computers.

• Adblock Plus
• AutoCopy
• Auto Context -  user popup menu on text selection
• AutoHideStatusbar
• Bar Tab
• Better Gmail
• Better Youtube
• Clear Cache button / Clear Private Data
• Context Search - adds option to select search engine on right-click context menu
• Define Word / Define
• DownloadHelper
• Download Statusbar
• Fission
• Flashblock

FlashGot

Gmark

Google Gears

Google Toolbar

Greasemonkey

Keyconfig

Menu Editor

Mouse Gestures Redox / All-in-one Gestures

Multiproxy Switch

Omnibar - adds capability similar to Google Chrome's location bar

Persona for firefox - Lightweight theme manager from Mozilla (in-built since Firefox 3.6)

Split Browser

Tab Mix Plus

URL Suffix - Continued

Voyage - History management

Weave / Firefox Sync