What firefox extensions do you use for web design/development? Although not all of mine are strictly related to this, most of them are:

* Colorzilla - grab the colour code of anything on any website
* MeasureIt - measure sizes and distances on any website
* Web Developer - toolbar giving hundreds of tools for website development
* eBay Negs - open all the negative comments that an eBayer has received in one list
* Search Status - Google PageRank and Alexa Rank in one place
* FireFTP - use FireFox as an FTP program
* Linky - open all highlighted links in new tabs
* AdSense Notifier - keep track of your AdSense income
* Word Count - count all the words in a highlighted paragraph
* Colour Contrast Analyser - check that colour schemes meet legal requirements
* IE Tab - open something in Internet Explorer without leaving FireFox
* GreaseMonkey - heaps more extensions, the best one being having the latest Dilbert cartoon show on the Google index page!

There's also the web developer toolbar which is fantastic in every way!

well i am current using AdSense Notifier and InFormEnter.... both of them are proving very useful. After looking at this list i might also try the following since it helps in designing...
Colorzilla / MeasureIt / Colour Contrast Analyser

Some of my favourites (although not necessarily design related):

Fasterfox
Tunes up your browser settings, and can pre-fetch and cache all links on a page while surfing. Webmasters worried about bandwidth can disable it through robots.txt

Stumble Upon
Social browsing tool. Great fun to use, and great for bringing in traffic to your sites.

New tab homepage
A nice little one that opens your homepage in any new tab. I use it for google, it's even handier than the search box.

Plus of course IE Tab, which rocks.

Oh my god, i do not have most of these extensions with my firefox.........I should get it done

Thanks a lot for the information folks !

LinkChecker - http://www.kevinfreitas.net/extensions/linkchecker/

This is pretty helpful, as I tend to include plenty of external links in my blog entries.

Measure It - http://www.kevinfreitas.net/extensions/measureit/

Use it mainly for measuring image dimensions, without photoshop!