Firefox 1.5 - Show us your extensions

Have you found any great extensions to make your Firefox experience all it can be? Leave a comment, and let us know.

Here’s what I’m currently using (list via ListZilla 0.7):

Interface Enhancements:
FLST 0.8.5 - Focus Last Selected Tab
Linkification 1.1.6 - Converts text links into genuine, clickable links.
Super DragAndGo 0.2.4d1 - Drag a link to open it in a new tab.
Tab Clicking Options 0.6.1 - Assign actions to clicking events on a tab
Viamatic foXpose 0.2 - Click on the icon to view all windows with a single click.
GrApple (Eos) 1.2 - GrApple Eos style
SessionSaver .2 0.2.1.030 - Magically restores your last browsing session.
Xinha Here! 0.2 - Opens Xinha HTML editor
CookieCuller 1.2.0 - Extended Cookie Manager–protect selected cookies
ReloadEvery 1.5 - Reloads webpages every so many seconds or minutes
ScrapBook 0.18.0 - This extension lets you save pages & collections.

Improve visited sites:
Adblock Plus 0.5.10 - Filters ads. Now with whitelisting and synchronization
CustomizeGoogle 0.39 - Enhance Google search results

Keep track of other sites:
Adsense Notifier 0.7 - Displays your adsense earnings on the statusbar
Gmail Notifier 0.5.3 - A notifier for Gmail accounts

SEO Tools:
SearchStatus 1.14 - Display the Google PageRank and Alexa ranking
SEO Links 1.0 - Show link-popularity and rankings of hovered links

Social Bookmarking:
del.icio.us 1.0.2 - Keep, share and discover all your favorite things
Digg This! 0.1 - adds Digg This! to the right-click or Tools menu.

Blogging and Site Development:
JustBlogIt 0.2 - JustBlogIt with a simple right-click.
Web Developer 0.9.4 - Adds a menu & toolbar with web developer tools