What is your favourite Firefox extension?

Just found this and I am verry happy.

It copies to the clipboard any text that you mark with the mouse.

I think it is very usefull, especially for those who are in Linux or X operating systems.

http://autocopy.mozdev.org/

I use these all the time: Google PR status, Temper Data, IE view and the developer toolbar (built in).

The others that i hear are good are the gestures and forecastfox.

Hey... you see Firefox 1.5 RC 3 was released a couple days ago?

IEView: https://addons.mozilla.org/extensions/moreinfo.php?id=35&application=firefox
IE Tab: https://addons.mozilla.org/extensions/moreinfo.php?id=1419&application=firefox
Google Pagerank Status: https://addons.mozilla.org/extensions/moreinfo.php?id=262
Tamper Data: https://addons.mozilla.org/extensions/moreinfo.php?id=966

Thanks for the links,

I haven't dowonloaded the 1.5 version yet but I will do. As it is a 3rd beta version I suppose it will not have too many bugs

I like much the SEO links extension.

It shows SEO info for each of the links in the page that you are :

http://www.webmasterbrain.com/seo-tools/firefox-extensions/seo-links/

That looks like a good one, except I think that it would waste a lot of my valuable time!

Why is that?

I will be too busy check the rankings for each link...  LOL

This is my new favourite.... LOL

https://addons.mozilla.org/extensions/moreinfo.php?application=firefox&category=Humor&numpg=10&id=974

hehe. funny.

I will put that too

Just downloaded the SEO tool.  Very cool!

I really like ColorZilla.  The Google PR bar is nice too but ColorZilla is just plain AWESOME!