I’ve found a great article with tricks and hacks all for Gmail – handy Firefox extensions, best Greasemonkey scripts, some desktop tools and lots of useful tips. While some might not work anymore or are already integrated by Google enjoy them.
FIREFOX EXTENSIONS
Gspace – multi-platform firefox addon that turns your gmail account into powerful online storage tool
Gmail Search Extension – search your gmail account directly from the firefox search bar
GcalQuickTab – toggle between gmail and google calendar with keyboard shortcuts
GTDInbox – turns your account into flexible and feature-loaded ToDo-management service (GTD …