What are your favourite web development add-ons for Firefox?

Firebug is a must, it is very good for many things, I mostly use it for examining a page and checking an element to see what styles are applied and/or changing the styles to tweak it then put back in CSS. (since I'm still new to more advanced CSS, I can attest to how nice this is)

As an addition to firebug, Page Speed plug in for it for analyzing speeds.

WDT (Web developer toolbar) is also a must.

I run ColorPicker instead of FirePicker

Although I have MeasureIt installed, since I realized WDT has same feature (under Misc->Display Ruler), I use it instead

Also a note for WDT, under the tools section, it is worth the time to add several in, I have entries to things such as DomainTools.com, Wacky Wayback, SEO Browser, and a few others), makes it nice to just click those in there.

Ok, I'm gonna cheat on this one, to push another program worth getting... FiddlerHook This is used to automatically route traffic through Fiddler when you have it running, which is great for monitoring activity on a page, seeing load times, AJAX calls, so much!) (yes, this is limited to windows, but nice if you are on windows)

Another nice one for if you are on Windows.. IE Tab, gives you an icon in the bottom right corner to open up an instance of your default IE install in the firefox window to see how it looks/behaves in IE (nice for quick checks, or like at work, one of our oldest CMS's can only be used in IE)

Lastly, Spell Checker (this one is hard to search for, so here is the link: http://sites.google.com/site/gaurangnshah/spellchecker ) Nice for spot checking spelling on a page. While it is basic and you can't add to the dictionary, it is nice to have it highlight what it finds. While I run InSpyder on the entire site before launching, it cannot catch spelling issues on things that require user interaction, (ie, the "Thank you" text from a form).

That is about my list.

-Greg

definitely its "firebug" and "web Developer" tool , both are awesome tool ..
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fire bug is great, it can tell many thing to us!

with all the good FF ad-ons im using, firebug is the most helpful one in terms of web debugging..make tracking of errors and fixing easier..other ad-ons im using is for SEO purposes

I think that firebug here will beat the others

Screen grab is my most favourite web development add-ons for Firefox becasue I am in the designing field so many times, I must have to take the images from the site so this add ons help me a lot to do this very easily and that's is why I can able to spend my time on other places.

My Fav add on is fire bug its very helpful to me i love this addon for fire fox .....

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Google Tool bar and Fire bug is my favorite Add on in fire For and also i use Robo form its very help me....

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Firebug

Firebug is the best addon !

My vote goes to firebug and web developer toolbars

I find firebug and web Developer tool the best one..i havn't came across the spell check tool..thanks for sharing Greg.

Corwin
TheMasterSEO

I've been using firebug.. Thanks for the additional information guys...

Firebug and web developer tool are best and must for a web developer.

i have ColorPicker, Firebug, rank checker, seo quake and few more add-ons on my FF

Currently i'm using for development purpose.
Firebug
Cookie Editor
SEO toolbars

Life Insurance

fire bug is great, it can tell many thing to us!

"firebug" and "web Developer both are good add on.

fire bug is great, it can tell many thing to us!

Firebug, Web Developer 1.1.9, FireFTP.
-clonepal

firebug, web developer and Cooliris

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Hello, There are I'm using various add on tools and out of all, My favorite add on: fire bog for web designing and for seo: fire form, inform enter, seo tool bars, copy all url etc....

My favourite Firefox add-on at the moment is the SEOMOZ bar. You do need an account to have access to all the features but there is a free version available. This toolbar supplies so many metrics for root domains/ sub domains and landing pages. It also has a handy tool called a SERP overlay which displays all the information on the SERP pages so you dont even have to click onto the site to know which sites hold authority etc. I find the information much more reliable than the outdated 'PageRank'. Anyone else use this?

In addition to FirePicker and ColorPicker, there is also Colorzilla, which works well for me.

Mine is SEO Quake and NoDofollow plugin for firefox.

Alexa Sparky and SearchStatus are 2 great firefox add-ons.

Helps your site while also helping other sites you visit. Because some people still care about their sites Alexa ranking. Even though the value of Alexa ranking is debatable.

I refer firebug.

I use, Firebug and WDT alongside Fontfinder.
Though, I use other tools as well but they are not Firefox plugins like mentioned in my signature.

- Stella.

I agree with everyone here, firebug will lead this list compared to other web development add-ons. Web developer and browser window resizer, FirePHP and Greasemonkey are few others which I use regularly.

FieBug for a fast easy check of your website's relevance

I always switch to firebug,web developer,seo tool bar,screen grab...
That's all make me a satisfied user..

I think the Google Toolbar is the best ...

i like dead link checker and page rank checker

I use only two for my needs:
1. Seoquake - you get a lot of seo info about a site ( pr, backlinks seen by Google, Yahoo, Bing, Alexa )
2. Fireshot - you can save picture from pages you are browsing.

Firebug, Seoquake

Hi, Firefox the best browser ever because it supports really good add-ons for Firefox like Quick proxy, SEO quake and many.

My favorite web development add-on is Firebug. I recently tried out Opera Dragonfly and I was really impressed. Also, it can be extremely useful for designers with a basic knowledge of HTML and CSS.

For firefox my favorite add-ons are a huge list. but i write it some of them.
SEO tool bar
Search Status
search box companion
Add this
SEO compete
GridFox
Web Developer Toolbar and many more. but i can't list here.

Firebug