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Below I've bulleted my add-ons/tweaks into two categories which should explain themselves. You are running Firefox 3, yes? There are also the developer add-ons (which I'd be curious to hear people's take on) most notable Firebug, User Agent Switcher and IE Tab (which is also useful for getting windows updates).

Must haves:

• Ad-block plus Firefox add-on - Blocks those pesky ads
• Introducing Ubiquity - It's Launchy/Quicksilver/Do-er for Firefox. Hot.
• there are two about:config tweaks (put in address bar, hit enter)
  • -set layout.spellcheckDefault value equal to 2 (This does spell check everywhere, not just the large text entry fields)
  • -set security.dialog_enable_delay equal to 0 (This one removes the four seconds delay before allowing you to install an add-on, do this one before installing add-ons)
• GoogleToolbar - actually, I just use it for the autofill and magic link things

Nice to have:

• BugMeNot - Right-click login to sites like NY Times etc, sometimes it's useful for journal articles
• Locationbar² - This adds domain name highlighting and the ability to click different parts of the address to be magically taken there
• Read it Later - This is a new one for me, but I really enjoy it.  It's essentially exactly what it says, and works somewhat like temporary bookmarks
• Delicious Bookmarks - del.icio.us bookmarks integrated into Firefox, it's much nicer than it used to be
• Download Statusbar - moves downloads to bottom of Firefox window, status bar etc.
• DownThemAll! - mass file downloader, good for blackboard, getting journal articles from a authors page, etc.
• Zotero - It's a swanky research tool, think Endnote for Firefox
• Book Burro - comparison book shops on amazon, half, buy, alibris, Barnes and Noble