Great Firefox add-ons

I'm a big fan of Firefox and have started using a new add-on which is just brilliant.

Using SEOpen, from one right-click, I can check a page's:

• Yahoo Backlinks
• Pages in Yahoo Index
• Google Backlinks
• Google Cache
• Pages in Google index
• Google Translate to English
• Google Related
• PageRank Check
• MSN Backlinks
• Pages in MSN Index
• Alexa Overview
• Alexa Traffic
• Alexa Related
• Alexa Backlinks
• "Mass Check" multiple sources at once
• Check DMOZ Inclusion
• Keyword Density
• Page Size Checker
• HTML Validator
• Server Header Viewer
• Wayback Machine
• Check robots.txt
• Whois Info

Fab.


This is a bit specialist (ahem) but some of the other add-ons I love can be useful for everyone:

TinyUrl Creator
Very easy copy'n'paste for a shorter URL

Tabbrowser Preferences
Useful things like retrieving closed tabs, copy tab URL

Snipshot
Edit images easily, simple crop, resize

Show Screen Captures
Displays thumbnail screenshots next to external links on a web page, this one I think I'll disable

ScrapBook
Extremely useful to clip pages or text but be even better if I was saving to my web repository, not my hard drive

Plain Text Links
Lets me open a URL from text

Menu Editor
Edit right-click menu

Image Zoom

IE Tab
Shows a page as it would appear in IE

Groowe Search Toolbar
Combines Google, Wikipedia (I use that a lot), Yahoo, de.li.cious etal

Greasemonkey
Great developer tool. More >

Advanced Dork

DOM Inspector

LinkChecker

ColorZilla
Copies any colour from a page.

DownThemAll!
Speeds up + manages downloading

deskCut
Puts a shortcut on your desktop

Adblock Plus
Blocks ads (except those served from the site, which some do)

What am I missing?