Yea, the extensions are my favorite part.. well, and the tabs.. There's even an extension to list what extensions you have:
Generated Fri Apr 29 2005 01:51:04 GMT-0500 (EST)
Enabled Extensions: (14)
Adblock 0.5.2.039 - Filters ads from web-pages
Autofill 0.2 - Automatically fill out HTML forms
BBCode 0.3.7 - Adds BBCode to the context menu for forums like Mozillazine (PHPBB and others). Based on Cussers pastequote extension.
Disable Targets For Downloads 0.9 - Prevents download links opening a blank window.
Download Manager Tweak 0.6.5 - A modification of the Firefox download manager that changes its appearance and allows it to be opened in a separate window, a new tab, or the sidebar.
ForecastFox 0.7.1 - Get international weather forecasts from weather.com, and display it in any toolbar or statusbar with this highly customizable extension.
lget 0.1 - Allows you to initiate a direct download of a file given a url
ListZilla 0.5.1 - Outputs an alphabetical list of either extensions or themes to a text, vB code, or HTML file.
Nuke Anything 0.2 - Allow hiding of almost anything via context menu
Plain Text Links 0.2 - Treat selected plain text urls as links, right click to open
QuickTabPrefToggle 0.0.4 - Adds a toggle button for single window mode.
Tab Clicking Options 0.5.1 - Select actions for clicking events on a tab or the tabbar
Wayback 0.1.1 - Displays an archived version of the webpage.
WebmailCompose 0.6 - Makes mailto: links load your webmail's compose page and adds a Compose link to the context menu.