nice collection, thanks for the contribution
As I am one of the many Firefox users I use many of its add-ons which make my work so much easier. And I would like to share with you list of 30 best handpicked Firefox add-ons, very useful for web designers and developers.
1. CSSMate - online CSS editor extension, similar with EditCSS.
2. ViewSourceWith - let you view page source with external applications.
3. PicLens - transforms your browser into a full-screen 3D experience for viewing web images.
4. FireShot -creates screenshots of web pages which you can modify.
5. SeoQuake - helps with search engine optimization and internet promotion of web sites.
6. Font Finder - simply highlight a single element and right click to view all CSS style.
7. Live HTTP Headers - view HTTP headers of a page and while browsing.
8. Modify Headers - allows you to add, modify and filter http request headers.
9. CSSViewer - simple and useful extension for view any part of CSS property at current pages.
10. EditCSS - it is easy way to view or modifier any stylesheets in the Sidebar just right click.
11. Firebug - view, edit, and monitor CSS, HTML and Javascript live at any web pages.
12. View Formatted Source - Displays formatted and color-coded source for each element.
13. Professor X - let's you see inside a pages head without viewing the source code.
14. CSS validator - one click to valid a page using the W3C CSS validator.
15. Validaty - provides you a button to validate a page using a validator like validator.w3.org.
16. Html Validator - adds HTML validation inside Firefox and Mozilla.
17. Copy as HTML Link - creates an HTML link to the current page using the selected text.
18. TableTools - sorts, filters or copies any HTML table.
19. CHM Reader - make firefox support Compiled HTML file reading.
20. PageDiff - Helps web developers and designers to see HTML code differences between web pages.
21. Clipmarks - let you save any parts of current web pages.
22. SourceEditor - view and edit source of HTML element.
23. Total Validator - provides true HTML validation using the official DTDs.
24. LinkChecker - check the validity of links on any web page.
25. Web Developer - adds a menu and a toolbar with various web developer tools.
26. Style Sheet Chooser II - allows you to choose author-provided alternate styles for a web site.
27. View Dependencies - lists all files which were loaded to show the page at a tab of info window.
28. Accessibar - enabling easy manipulation of web page display and text-to-speech output.
29. Aardvark - used for cleaning up a page prior to printing it for making the page more readable.
30. JSview - Adds ability to view the source code of external files.
Sorry, comments for this entry are closed at this time.
nice collection, thanks for the contribution
hi, nice list. My list is a little bit smaller. here it is:
http://www.myaddonslist.eu/user/master
thank you nice sharing
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Excelente ayuda, gracias
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hi good site thx
For this list I would add ColorZilla, it is best tool for probe exactly color from any point of html page. It is very usefull.
there is febe for backing up your plug ins and zotero for research, all in one tab, foxmarks and a lot more that are cool
@nice list - definitely goes to my bookmark list -
in mine too!
@ KMB
Thanks for noticing,
could you tell me what browser/version are you using?
A lot of redundancy going on here.
All the CSS-stuff is done as good as it gets by Firebug and the Webdeveloper, same for the Validation, SourceEditoring etc.
PS: Your CommentPreview is broken.
Thank for the good words i appreciate it 
The list isn’t ordered right now, but thanks on comments about that
@ Ivan and Jon
It’s corrected now
@ Nikola
Thanks for adding me to your list http://www.3kolone.org/bookmarks.php it’s really good
Great list. One thing, though–the link to Fireshot is wrong. It should be: https://addons.mozilla.org/en-US/firefox/addon/5648. I really like it because it allows screenshots of an entire page, not just the area visible on the screen. Thanks again for the list!
Great list, however I think that Aardvark, Firebug and Web Developer are probably the top 3— in that order. Aardvark especially is much more than “cleaning up for print.” The ability to remove elements in the page is a very minor feature of that plugin. The best part of it in my opinion is the ability to turn it on and find elements and view their source, very handy for dynamic pages. Firebug of course is great for editing CSS, HTML and JavaScript live on a page— as well as watching HTTP headers and JavaScript calls.
SEOQuake leads to Clipmarks page 
Anyway, great great list, thank you very much!
nice list - definitely goes to my bookmark list - http://www.3kolone.org/bookmarks.php
@ G.Suvorov
You are welcome
Thank you for including SeoQuake in this list!
If you have any ideas how to improve it - please let us know.
regards.
Are you promoting ClipMarks or something? ><
Great list!
Thanks
on June 14, 2008
Hi, just surfed in. I enjoyed looking around your web site. This site has been very useful to me so far and I have barely scrathed the surface of it.