I just read through Flexbeta's Guide To Firefox Extensions and ended up installing a couple more Firefox extensions. My current list of extensions is:

• DOM Inspector (rarely use, just re-enables the old DOM Inspector)
• BugMeNot (frequently use, makes it much easier to read news on registration-required sites)
• SpellBound (frequently use, lets me spellcheck )
• Web Developer (frequently use, though prefer CSS editing bookmarklets in general)
• Adblock (always in use, NYTimes and WaPo never looked more legible)
• Copy Plain Text (imagine I'll use, haven't had the need yet, cleans up clipboard text)
• Translate (sometimes use, saves me from typing in babelfish)
• LiveHTTPHeaders (frequently use, awesome if you sysadmin or write servlets)
• MiniT (sometimes use, lets me reorder tabs)

Just installed: * DictionarySearch (search for definition of any word on page) * FLST (when you close a tab Firefox will switch to the last open tab, which seems more correct) * Allow Right-Click (override annoying javascript that disables right click menu) * ImageZoom * Statusbar Clock (can't have enough clocks on my desktop)