1. NASA Night Launch – Firefox Theme

Dark theme for Firefox. Inspired by the night launch of STS-116. This theme is for people who like it dark. If you’re running a dark desktop then this is for you. So zip up your flight suit, make sure your harness is secure, and enjoy the ride.

2. Gradient iCool (Blue) – Firefox Theme

Light up your Firefox with this black and blue theme. This theme is now compatible with Personas, Colorful Tabs, Tab Mix Plus, ChromaTabs Plus, etc.

3. Strata40 – Firefox Theme

Inspired by Firefox 4 mockups. This theme aims to give the user an interface as close to the new Firefox 4 mockups as possible.

4. ACE Foxdie – Firefox Theme

All-In-One foxy suit (Stylish and full color schemes)

5. Silvermel – Firefox Theme

A Creamy Silvery Experience. This theme is a modification from the fantastic theme Charamel.

6. RedShift V3 – Firefox Theme

The next generation Firefox theme. RedShift V3 pushes Firefox to it’s limits. Fully skinned and fully functional, RedShift V3 gives you the aesthetic pleasure you want with an advanced program.

7. Blue Fox – Firefox Theme

This theme is the Blue version of Bloody Red called Blue Fox.It works with FF 3.0.* 3.1b and 3.5. It is really nice. The mixture between the blue and black is cool and it is perfect for people who like dark themes.

8. Black Steel – Firefox Theme

A dark sleek theme for people who like dark themes.

9. Chromifox Basic – Firefox Theme

Chromifox Basic is a coat of Chrome for Firefox. It’s a bright and soft blue theme for Firefox on Windows, Mac OS X, and Linux, inspired by the appearance of the Google Chrome browser and its open source roots, Chromium.

10. Noia 2.0 (eXtreme) – Firefox Theme

This is a fully skinned version. This theme is based on the Noia 2.0 icon set by Carlitus( http://carlitus.deviantart.com ).

11. Office 2007 Black – Firefox Theme

A theme based on the Office 2007 Black colours. Integrates well with the Windows XP Zune theme, the default Vista graphite colours, and the MetaCity-Zune theme on Ubuntu

12. LavaFox V1-Blue – Firefox Theme

A dark and hot theme for Firefox. Fully skinned, every window and menu. Custom throbbers and toolbar icons. Cool animations on scrollbars and progressbar.

13. MacOSX – Firefox Theme

MacOSX theme for Firefox 3.5.

14. Black Stratini – Firefox Theme

Another theme for people who like dark theme. All highlights are in dark blue, as blue is the most common highlight color for Windows and Mac color schemes. Black Stratini uses Stratini Padded icons and spacing in Large Icons mode and Stratini icons in Small Icons and Teeny modes.

15. FennecFox – Firefox Theme

This theme is based on the default theme for Firefox Mobile, Fennec. The original designs were created by Sean Martell.

16. A Bloody Red Firefox Theme

This Theme works with FF 3.0.* and FF 3.5. It is really nice. The mixture between the red and black is cool and it is perfect for people who like dark themes.

17. Walnut – Firefox Theme

Walnut for a wooden look and feel. Walnut is a complete skin redesign so that all windows, widgets, panels, and even the addons have a wooden look and feel. Supports many extensions

18. Ambient Fox Xyan – Firefox Theme

Cyan glow Ambient Firefox theme, Works with 3.0-3.5.x

19. ANTHEM – Firefox Theme

ANTHEM is a take on originality and recent UI trends for Firefox web browsing. It was built on the original Mac theme that comes OOB with the FF3 install.

20. MushroomKingdom 2 – Firefox Theme

MushroomKingdom is a theme for all of the Super Mario Bros. fans out there. It features a landscape-style background, colorful icons with personality, and pipe scrollbars (coming soon).

21. Revelation 3.6 – Firefox Theme

Firefox the way it should look. Glassy Deep Red buttons on a shiny black toolbar makes this theme a must have for fans of dark themes.

22. AvantGarde Nightlife – Firefox Theme

Dark, sexy, but most of all, professional. Who can resist the scintillating rich colours and mysterious dark hues of Nightlife?

23. Vfox – Firefox Theme

Clean, professional and elegant. Apple style with Firefox

24. Charamel – Firfefox Theme

A Creamy firefox them with sugary experience

25. God of War – Firefox Theme

A theme based on the God of War game series. It’s made for those who enjoy a dark theme. Toolbar icons are big. If you’re looking for minimalism, then this theme isn’t for you. (Although, when set to “small icon mode” the viewable window isn’t very different from the most popular themes at AMO)

26. Camifox – Firefox Theme

Camifox is elegant, crisp, and colorful. It’s a thoughtful and sophisticated reimagination and realization of a better “default”-like theme for Firefox, in living color on all platforms, inspired by the appearance of the excellent Camino browser.

27. Qute – Firefox Theme

Simple and unobtrusive theme with clear and colorful icons. Qute is the oldest available theme for Mozilla Firefox and was the default theme for a while before Firefox reached 1.0.

28. Go Green – Firefox Theme

Go Green Firefox theme for Green Ecology enthusiasts. Currently only supported by Windows OS.

29. Rein – Firefox Theme

Mearning for rein in German is pure. The simple theme of the color scheme of OS. It dyes to your color.

30. Past Modern – Firefox Theme

A theme based on the SeaMonkey Modern theme. This theme doesn’t support User Interfaces for Right-To-Left Languages and Windows Touch of Windows 7

31. Red Cats (blue flavor) – Firefox Theme

There can never be too many cats! Turn your Firefox into Firecat and enjoy browsing in the furry company. The theme is also available in green flavor.

32. PinkHope – Firefox Theme

PinkHope is a Firefox theme for Breast Cancer awareness. It’s very pink and is one way you can help spread awareness at home, school or work without saying a word. The bright colors and pink ribbon are enough to let anyone know the cause.

33. Pink-bee – Firefox Theme

A pink theme for a better browser, with nice bees, which should appeal to children. This theme was created for the Firefox browser is a little more fun to use for you and your children, this theme “Pink-bee” is easy to use.

34. Slickerfox – Firefox Theme

Slicker, simpler, smaller, flatter and fuller foxier. Simplicity and intuitive control is the overall goal of this firefox theme.

35. FoxWorld – Firefox Theme

The World like theme for Firefox. Excellent skin, simple and clean

36. OldFactory Black – Firefox Theme

With this theme, dress your Firefox in an old-fashioned garment. This is the basic “black edition” of OldFactory.

37. PimpZilla – Firefox Theme

This Firefox Theme is probably the most tacky & overdone piece of GUI design ever. Accept no less: Surf in style and browse like a king!

38. Utopia FFSE White – Firefox Theme

The fox meets Utopia. Very nice Firefox Theme available in different color variations.

39. Glaze Black – Firefox Theme

A dark, glassy, almost flat theme. Basic iconography has been recycled from the Utopia theme.

40. Blu Canidae – Firefox Theme

A modified iFox with Photoshop CS3 style icons. This was designed to be a cleaner, blue version of iFox.

41. MonoChrome – Firefox Theme

A monochrome version of the default windows firefox 3-3.6.* theme, Strata.

42. Purity – Firefox Theme

A theme without visual spam. Simple flat designs tend to be more appealing than overly decorated ones. The toolbar icons are inspired by the Naver theme.

43. GrayModern – Firefox Theme

GrayModern2 is a port of popular classic GrayModern Mozilla Firefox theme. It is based on original themes by Bernie Zimmermann and Johannes Schellen.

44. Dark Revisited – Firefox Theme

A dark theme, but with more balance than most dark themes.

45. Mythical Sirens Summer Night – Firefox Theme

Mythical Sirens Summer Night, feral beauty in a deep purple garden, blossoming to midnight fireworks. Decorative surrealist browser theme featuring mythical flora and fauna.

46. Phoenity Next – Firefox Theme

A simple and colorful theme for everyone, with a new style

47. Cold Night – Firefox Theme

Another dark Theme for Firefox

48. Classic Remix for Windows 7

Remix of Classic Theme with some modifications for Windows 7 compability. Toolbar buttons in style of Firefox 3.7.

49. Stratini – Firefox Theme

Compact theme inspired by Strata.

50. Vista Red – Firefox Theme

A mix of Vista and XP strata themes for Firefox 3 in Red.

51. Simple Green – Firefox Theme

A refreshingly clean, compact theme combination for both Mozilla Firefox and its companion mailnews client, Thunderbird.

52. Kempelton Large – Firefox Theme

Bigger version of the Kempelton theme. Try to check ‘Use Small Icons’ when using this theme if you want less big icons. Use the standard Kempelton theme instead if you want a more typical icon size.

53. Baby Blue – Firefox Theme

This is BabyBlue theme for Firefox 3.5. BabyBlue is a clean and soft light blue theme for Firefox. This theme implements Preferences, Download, Extensions, and many other of the Firefox panels. All with a lighter soft blue color.

54. Fopera – Opera 10 on Firefox

Default skin from the popular browser, Opera 10. Doesn’t work on Mac.

55. Brazil Firefox Theme

With the World Cup coming up, don’t we need a theme for the best soccer team in the world?

56. Devious Green – Firefox Theme

A theme based on the color scheme of DeviantArt.com

57. Foxscape – Firefox Theme

A full featured retro theme for Firefox based on Netscape Communicator 4.8 on Windows.

58. Lovely Lilac – Firefox Theme

This is LovelyLilac theme now available for Firefox 3.5. LovelyLilac is a clean and soft lilac color theme for Firefox.

59. RulerDark – Firefox Theme

RulerDark is a simple to use and install dark theme for your Firefox browser.

60. Phoenity Modern – Firefox Theme

Phoenity based on the SeaMonkey Modern theme.

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There is a huge list of  Firefox Addons or Extensions available to download but here today we will discuss only 30+ Best Firefox Addons for Web Designers and Developers. You are not required to download or install all Firefox Addons or Extensions. There is a little brief with each Firefox Addon so you can read and decide which Addon suites you.

You can mention other “Best Firefox Addons for Web Designers and Developers” in the comments section. Also you might be interested to Be the first to know the latest happenings on Smashing Share.

Greasemonkey

Greasemonkey is a Firefox addon / extension  that allows you to customize the way webpages look and function. Hundreds of scripts are already available for free. And if you’re the tinkerer sort, you can also write your own.

Fasterfox

Fasterfox allows you to tweak many network and rendering settings such as simultaneous connections, pipelining, cache, DNS cache, and initial paint delay. Dynamic speed increases can be obtained with the unique prefetching mechanism, which recycles idle bandwidth by silently loading and caching all of the links on the page you are browsing.
A popup blocker for popups initiated by Flash plug-ins is also included.

Firebug

Firebug is an awesome Firefox Addon for Web Designers and Developers. Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.

Web Developer

The Web Developer addon / extension adds a menu and a toolbar to the browser with various web developer tools. After installing the extension there is a ‘Web Developer‘ menu under the ‘Tools’ and context menu of the browser, as well as a new toolbar.

FireFTP

FireFTP is a free, secure, cross-platform FTP client for Mozilla Firefox which provides easy and intuitive access to FTP servers.
Along with transferring your files quickly and efficiently, FireFTP also includes more advanced features such as: directory comparison, syncing directories while navigating, SFTP, SSL encryption, search/filtering, integrity checks, remote editing, drag & drop, file hashing, and much more!

YSlow

YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages. YSlow is a Firefox add-on integrated with the Firebug web development tool. YSlow grades web page based on one of three predefined ruleset or a user-defined ruleset. It offers suggestions for improving the page’s performance, summarizes the page’s components, displays statistics about the page, and provides tools for performance analysis, including Smush.it™ and JSLint.

FirePHP

FirePHP enables you to log to your Firebug Console using a simple PHP method call.
FirePHP is ideally suited for AJAX development where clean JSON or XML responses are required. All data is sent via a set of X-FirePHP-Data response headers. This means that the debugging data will not interfere with the content on your page.

Gridfox – The Grid Layout Firefox Extension

GridFox is a Firefox extension that overlays a grid on any website. If you can open it in Firefox, you can put a grid on top of it. It’s easy to customize, allowing you to create the exact grid you designed your layout around.

FireShot

FireShot is a Firefox Addon / Extension that creates screenshots of web pages (entirely or just visible part).
Unlike other extensions, this plugin provides a set of editing and annotation tools, which let users quickly modify web captures and insert text annotations and graphical annotations. Such functionality will be especially useful for web designers, testers and content reviewers.

Screengrab

Screengrab saves entire webpages as images. It will capture what you can see in the window, the entire page, just a selection, a particular frame… basically it saves webpages as images – either to a file, or to the clipboard.
It can capture any Java or Flash embedded in a page, but to do this it requires Java to be installed in the browser.

ColorZilla

With ColorZilla you can get a color reading from any point in your browser, quickly adjust this color and paste it into another program. You can Zoom the page you are viewing and measure distances between any two points on the page. The built-in palette browser allows choosing colors from pre-defined color sets and saving the most used colors in custom palettes. DOM spying features allow getting various information about DOM elements quickly and easily.

ColorSuckr

Make getting image colors even easier with the ColorSuckr Add-on for the Firefox browser. Install the add-on, then simply right click any image on a webpage and choose ‘Extract Image Colors’ from the menu to go straight to the ColorSuckr website with the image.

CS Lite

CS Lite is a lighter, scaled down version of CookieSafe. This Firefox Addon contains less features, but is considerably easier to use. The extension has been completely recoded from top to bottom making this the most stable version to date.

CSSViewer

CSSViewer is a great Firefox Addon for Web Designers and Developers to learn CSS. When you hover on any element, it will display all CSS styles for that element.

Dummy Lipsum

Dummy Lipsum Firefox Addon/ Extension generates “Lorem Ipsum” dummy text (the text is taken from the Lorem Ipsum site). A context menu option (“Insert Dummy Lipsum”) is shown in the context menu when the cursor is in a form field (text field or text area). This option automatically fills this field with the dummy text.

IE Tab

IE Tab is a great Firefox Addon for Web Designers and Developers, since you can easily see how your web page displayed in IE with just one click and then switch back to Firefox.

IE NetRenderer

IE NetRenderer adds buttons, tools menu and contextual menu entries to get a screenshot of the current page.
Keyboard shortcuts are also available: Ctrl+Shift+F5/F6/F7/F8 to render the page in IE5.5/6/7/8 Beta 2 (Cmd+Shift+F* on Mac).
Really useful for webmasters which are not using Windows!

LiveHTTPHeaders

LiveHTTPHeaders allows you to analyze HTTP headers (response and requests). It help debugging web application. You can see which kind of web server the remote site is using and cookies sent by remote site.

OperaView

OperaView is an Addon/ Extension for Mozilla Firefox and Flock which is very similar (and actually based on) IE View.
Even if you are using Mozilla browser all the time, sometimes you need to view the page you are looking at in Opera browser (especially if you are a web developer). OperaView makes that process easier by adding the item View This Page in Opera to the page context menu, the item Open Link Target in Opera to the link context menu and a button to the toolbar. If you want to open a page in Opera quickly, just right click somewhere on the page and choose new menu item.

Adblock Plus

Ever been annoyed by all those ads and banners on the internet that often take longer to download than everything else on the page? Install Adblock Plus Firefox Addon now and get rid of them.

FEBE

FEBE (Firefox Environment Backup Extension) allows you to quickly and easily backup your Firefox Extensions. In fact, it goes beyond just backing up — It will actually rebuild your extensions individually into installable .xpi files. Now you can easily synchronize your office and home browsers.

Xmarks (formerly Foxmarks)

Xmarks (Formerly Foxmarks) is the #1 bookmarking add-on. Install it on all your computers to keep your bookmarks and (optionally) passwords backed up and synchronized. Xmarks also helps you uncover the best of the web based on what millions of people are bookmarking.

Font Finder

Font Finder simply highlight a single element (e.g. a paragraph or a strong tag ), right-click and select `Font Finder`, then marvel as the full CSS text styling of the selected element appears.

URL Fixer

URL Fixer corrects typos in URLs that you enter in the address bar. For example, if you type google.con, it will correct it to google.com (asking first, if you enable confirmation).
This version will correct common misspellings of .com, .net, .org, .edu, .gov, .mil, and all other mainstream TLDs, as well as the protocol (http:, https:). By right-clicking on the address bar, you can set it to auto-correct your errors, or you can have it ask you before making any corrections.

MeasureIt

MeasureIt is a Useful Firefox Addon for Web Designers. This Addon draw out a ruler to get the pixel width and height of any elements on a webpage.

Window Resizer

Window Resizer resize your browser to various standard resolution sizes. It is useful for testing different screen sizes. It accurately resizes your browser so you can test to see what a web page looks like in all of the standard resolution sizes. Supports the 640×480, 800×600, 1024×768, 1280×800, 1280×1024, 1600×1200 resolutions.

Palette Grabber

Palette Grabber creates a color palette for Photoshop, Paint Shop Pro, GIMP, Flash, Fireworks, Paint.NET, or OS X based on the current page.

Panic

Are you looking at stuff you shouldn’t be? Whether you are browsing through social networking sites while you’re at work or wandering around MySpace while you’re at school? Well Panic Firefox Extension gives you the ability to close all tabs, while opening another one that will make it look like you are doing what you should be doing.

Cooliris

The Cooliris 3D Wall — Simply the fastest and most stunning way to browse photos and videos from the Web or your desktop. Effortlessly scroll an infinite “3D Wall” of your content from Facebook, Google Images, YouTube, Flickr, and hundreds more.

Morning Coffee

Morning Coffee keeps track of daily routine websites and opens them in tabs. This extension lets you organize websites by day and open them up simultaneously as part of your daily routine. This is really handy if you read sites that update on a regular schedule (like webcomics, weekly columns, etc.)

ReminderFox

ReminderFox displays and manages lists of date-based reminders and ToDo’s. ReminderFox does not seek to be a full-fledged calendar. In fact, the target audience is anybody that simply wants to remember important dates (birthdays, anniversaries, bills, etc) without having to run a whole calendar application. ReminderFox makes sure you remember all of your important dates via easy-to-use lists, alerts, and alarm notifications.

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