The latest version of Firefox has the following changes:
* Drastically improved memory handling for certain use cases
* Added a new rendering backend to speed up Canvas operations on Windows systems
* Bookmark and password changes now sync almost instantly when using Firefox Sync
* The ‘http://’ URL prefix is now hidden by default
* Added support for text-overflow: ellipsis
* Added support for the Web Timing specification
* Enhanced support for MathML
* The WebSocket protocol has been updated from version 7 to version 8
* Added an opt-in system for users to send performance data back to Mozilla to improve future versions of Firefox

Click Here to see complete list of changes.

Download Firefox 7:
Download for Windows
Download for Linux
Download for Mac

Firefox 6 contains the following changes:
* The address bar now highlights the domain of the website you’re visiting
* Streamlined the look of the site identity block
* Added support for the latest draft version of WebSockets with a prefixed API
* Added support for EventSource / server-sent events
* Added support for window.matchMedia
* Added Scratchpad, an interactive JavaScript prototyping environment
* Added a new Web Developer menu item and moved development-related items into it
* Improved usability of the Web Console
* Improved the discoverability of Firefox Sync
* Reduced browser startup time when using Panorama

Click Here to see complete list of changes.

Download Firefox 6:
Download for Windows
Download for Linux
Download for Mac

Firefox 5 has the following new features and changes:
* Added support for CSS animations
* The Do-Not-Track header preference has been moved to increase discoverability
* Tuned HTTP idle connection logic for increased performance
* Improved canvas, JavaScript, memory, and networking performance
* Improved standards support for HTML5, XHR, MathML, SMIL, and canvas
* Improved spell checking for some locales
* Improved desktop environment integration for Linux users
* WebGL content can no longer load cross-domain textures
* Background tabs have setTimeout and setInterval clamped to 1000ms to improve performance

Click Here to see complete list of changes.

With Twitter Address Bar Search, users can discover richer and more relevant Twitter search results directly from the Firefox Address Bar.The add-on makes searching Twitter in Firefox a snap. You can search for #hashtags and @usernames by entering the searches directly into the Firefox Awesome Bar, and you’ll be taken to Twitter search results.

Twitter Address Bar Search works with the latest version of Firefox for Windows, Mac OS X, Linux. You can download Twitter Address Bar Search Add-on from Firefox Add-ons gallery. If you aren’t a Firefox user, you can download the Mozilla Firefox with Twitter bundle from firefox.twitter.com.

Plugins play a very important role in increasing the functionality of firefox and making it perfect, all in one browser.If you are a webmaster or blogger then you can’t deny the importance of SEO.Search engine is one of the main source to get traffic on your sites from particular keywords and definitely you want to increase the ranking and popularity of your websites keywords in search engine.

By using SEO Plugins for Firefox you can check your website keywords ranking,alexa ranking,keyword popularity and pagerank which is the most important thing to get high search engine listing.After searching for nice SEO plugins for firefox, i have found some nice SEO Plugins for firefox, which i want to share with your guys!

1) Google Toolbar for Firefox

Shows the page ranks and some important information about your website.

2) SeoBook Toolbar

Install the SEO Toolbar on your Firefox browser. Gain a competitive advantage. Become an SEO guru.The SEO Toolbar pulls in many useful marketing data points to make it easy get a holistic view of the competitive landscape of a market directly in the search results.

3) Search Status

SearchStatus is a toolbar extension for Firefox and SeaMonkey that allows you to see how any and every website in the world is performing. Designed for the highly specialised needs of search engine marketers, this toolbar provides extensive search-related information about a site, all conveniently displayed in one discreet and compact toolbar.

4) Alexa Sparky

Alexa Internet’s free Firefox extension! Alexa’s extension accompanies you as you browse, providing you with Alexa data about the sites you visit without interrupting your browsing.

Discover website traffic trends -- Is this site getting more popular, or less?

Get detailed traffic information including Reach and Rank – How does this site’s traffic compare to other sites on the Web?

Surf more efficiently with Related Links for each page – If I like this site, are there others that I might want to visit?

5) NoDoFollow

Just a simple extension to highlight links in a page according to nofollow / dofollow status.

6) Seoquake

Seoquake is a powerful tool for Mozilla Firefox, aimed at helping web masters who deal with search engine optimization and internet promotion of web sites. Seoquake allows user to obtain and investigate many important SEO parameters of the internet project under study on the fly.

7) SEO Link Analysis

Link data in Google Webmaster Tools, Yahoo! Site Explorer and Microsoft’s Webmaster Portal is pretty static, they give you the pages a site has links on, and let you do all the analysis with other tools. That sucks if you want to do a quick analysis of a site, or want to get a quick overview of inbound anchor texts for a site.

This Firefox extension gives you a bit more information when opening such pages, it gathers the PageRank for the linking page, the anchor text used on the link, and checks whether the link is nofollowed or not.

SearchPreview

he extension previously known as GooglePreview. Inserts preview images (thumbnails) and popularity ranks of web sites into the Google, Yahoo and Bing search results pages.

9) DeeperWeb

Easily navigate through Google search results using a fast, simple and useful Tag-Cloud technique. Use our Topic-Mapping-Technologies for quick access to answers, news, videos, blogs, Wikipedia and more. Install now and boost your search.

10) Smart Toolbar

Smart PageRank’s ‘Smart Toolbar’ is small, simple, and powerful. It gives you quick access to powerful SEO tools. It also includes the Alexa Rank and Page Rank (trademarks of Alexa and Google respectively). The usage of this toolbar will increase the Alexa Rank of the websites you visit.

Firefox 4 Release Candidate contains the following new features:
New Tab Location: Tabs are given top visual priority for more efficient and intuitive browsing.
Switch to Tab: Navigate more easily by switching to open tabs from your Awesome Bar.
Firefox Button: All your menu items are in a single button for easy access and reduced clutter.
App Tabs: Take sites you always keep open—like Web mail—off your tab bar and give them a permanent home in your browser.
Stay in Sync: Synchronize your settings, passwords, bookmarks, history, open tabs and other customizations across multiple devices so you can take Firefox with you wherever you go.
Manage Add-ons: An easier way to manage add-ons and discover new options for personalizing browsing.
Organize Tabs: Reclaim your browser from tab clutter! Drag and drop your tabs into manageable groups that you can organize, name and arrange in a fun and visual way.

To see complete list of new features Click Here.

What’s New:
* Tabs are now on top by default on Windows only – OSX and Linux will be changing when the theme has been modified to support the change.
* On Windows Vista and Windows 7 the menu bar has been replaced with the Firefox button.
* You can search for and switch to already open tabs in the Smart Location Bar
* New Addons Manager and extension management API (UI will be changed before final release)
* Significant API improvements are available for JS-ctypes, a foreign function interface for extensions.
* The stop and reload buttons have been merged into a single button on Windows, Mac and Linux.
* The Bookmarks Toolbar has been replaced with a Bookmarks Button by default (you can switch it back if you’d like).
* Crash protection for Windows, Linux, and Mac when there is a crash in the Adobe Flash, Apple Quicktime or Microsoft Silverlight plugins.
For complete list of change and improvements see Release Notes.

Please note that this is a beta version of  Firefox 4.0, it may contain some bugs and it shouldn’t be used as primary browser. If you want to test Add-Ons with Firefox 4 Beta, you should install the Add-On Compatibility Reporter first.

Mozilla Firefox 4.0 Beta 1 Available for Download on Mozilla website but Mozilla has not posted detailed release notes yet, still there is no official announcement from Mozilla. Mike Beltzner, who is in charge of Firefox at Mozilla, said in the Firefox group discussion that “We’re still a ways off from builds. I’m watching the tree, but we’re about an hour out from seeing Windows results.”

This is an initial release of Firefox 4.0 Beta 1 that’s why it shouldn’t be used as primary browser. There are still some issues in Firefox like rendering problems in the menu bar on Windows Vista, D2D hardware acceleration is still disabled by default etc.

Firefox’s JavaScript performance is good but Google Chrome’s JavaScript performance is best. Firefox 4.0 Beta 1 JavaScript performance is much better than Firefox 3.6.6, but the goal to hit 500 ms may be still a few weeks away.

Via conceivablytech.com

1) All-Glass for Firefox:
Gives your Firefox a clean and fresh look by adding Aero Glass pretty much everywhere in the frame!

2) Glasser:
Adds the Windows Vista glass frame to Firefox toolbars.

3) NEW Glasser:
Known Glasser – addition which he will make resemble your Firefox to Vista and 7 (Windows 7). Be based on All-Glass Firefox mod!

4) Simpler Glass:
A simple glass theme (formerly Glassier).

5) Camiglass:
A bit of lovely white glass for those a bit tired of the monotony of stormy gray metal plastic buttons to match gray backgrounds.

6) Classic Remix for Windows 7:
This is a theme contain graphics from the Firefox 3.7 Mockup & Firefox 4.0.

7) AeroBuddy:
This add-on is based on the original Glasser. What sets this add-on apart from the others is its unique features.

Strata40 Lite:
Strata40 Lite is a theme for those people who want their browser to look like the mockups but don’t necessarily want to give up compatibility with their other add-ons. This is where Strata40 Lite comes into its own.

9) VisionDirect:
Discounts on Tom Ford Sunglasses, Prada, Ray Ban, Bolle.

* Improved Speed
* New Personas
* Web open Font Format
* Outdated Plugin Detection
* Drag and Drop
* Full Screen Open Video support
* CSS Gradients and Backgrounds for Developers
* File API
* Desktop Orientation Sensors