Must have Firefox Ad-ons

I did some searching and couldn't find anything related to Firefox specifically. I'm not a fan of tools per say, but I am about using tools if it keeps me from spending too much time when I can get a quick glimpse from a tool. On that note...

I'm curious to know what you all feel are must have Firefox add-ons. I have used a multitude of different ones but with a recent update, I lost everything.

Currently I'm using Quirk SeachStatus. Himanshu wrote about it earlier but this is definitely a nice, compact tool. I also use SEO Link Analysis. It gives you PR, No follow and anchor text info for links in Yahoo Site Explore and Google Webmaster Tools. I haven't quite figured out all of the info it displays and how to interpret it but you can still take something valuable from it. Both of these tools are free!

I've been seeing a references to seomoz and seobook tools. Just looking to see what some of you use and find beneficial to making your day a little easier.

I have been using SEO4Firefox and I like it. Mainly for the options to automatically highlight nofollow links and shows a lot of optional stats you can have it look for in any google search such as PR, Cache Date, Traffic Value, Age, Digg's, Stumbleupon, Twitter, Alexa, Wiki, Google and Yahoo Position,etc etc...the list goes on and on. Most of these are turned off by default, which is a good thing because it would take a LONG time for your good search result to come up if it had to take all this information for each of the top 10 pages for that given term/phrase. It is nice to see what all the competitors PR, Domain Age, links, and whether it is in DMOZ or not right off the bat. I'm sure there are many other programs that do these things, some probably even better, but it works for me so there my 2c.