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.
I add also these...
Sage is a lightweight RSS and Atom feed aggregator extension for Mozilla Firefox. It's got a lot of what you need and not much of what you don't...
Sage is a basic and lightweight RSS Reader, although you need to be a techie to use it. It leverages Firefox bookmarks to store feeds - and it does the job pretty well.
Foxmarks Bookmark Synchronizer 2.1.0.12
Κατηγορίες
Αν χρησιμοποιήτε τον Firefox σε πολλούς υπολογιστές τότε το Foxmarks σας είναι απαραίτητο. Εγκαταστήστε το σε όλους τους υπολογιστές και αυτό θα δουλεύει σιωπηρά στο παρασκήνιο ώστε οι σελιδοδείκτες σας να είναι συγχρονισμένοι σε όλα τα μηχανήματα. Μπορείτε επίσης να συνδεθείτε στο my.foxmarks.com ώστε να διαχειριστείτε τους σελιδοδείκτες σας από οποιοδήποτε υπολογιστή.
BetterSearch 1.20
Κατηγορίες
An extension for Firefox and Flock which enhances Google (all international flavours, too), Yahoo! Search, del.icio.us, MSN Search and several other sites by adding previews (thumbnails), Amazon product images and additional functionality.
Προσθήκη στον Firefox
Zotero [zoh-TAIR-oh] is a free, easy-to-use Firefox extension to help you collect, manage, and cite your research sources.
Advanced Eyedropper, ColorPicker, Page Zoomer and other colorful goodies...
One Password To Rule Them All!
ShowIP 0.8.08r14b0251
Κατηγορίες
Show the IP address(es) of the current page in the status bar. It also allows querying custom information services by IP (right mouse button) and hostname (left mouse button), like whois, netcraft. Additionally you can copy the IP address to the clipboard. This...
Server Spy 0.1.6
Κατηγορίες
Server Spy indicates what brand of HTTP server (e.g. Apache, IIS, etc.) runs on the visited sites.
Screengrab! 0.95 
Categories
Screengrab saves entire webpages as images...
ScribeFire Blog Editor 2.2.10
Categories
ScribeFire is a full-featured blog editor that integrates with your browser and lets you easily post to your blog.
Add to Firefox
Flashblock 1.5.6
by
Lorenzo Colitti,
Philip Chee Categories
Never be annoyed by a Flash animation again! Blocks Flash so it won't get in your way, but if you want to see it, just click on...
