Well, according to the latest survey firefox is the second most used browser in the world. chrome is definitely catching up. And to be very frank , its the browser of my choice:D (
Now the question arises, why firefox?
you may choose firefox because it is fast, safe and open-source, which means you can modify  anything for it( if you know how).It is multi platform and the most important is its pluggable extension feature, it means that firefox gives you certain number of features and if you want to make it more you can make extensions.
about firefox security
While no browser is 100% secure Mozilla Firefox has much better security than Internet Explorer. Firefox does not support Activex which is a tool that can be used with good and bad intentions. Activex allows web sites to have more access to Windows. As a result of this, cyber criminals have taken advantage of it. This means that viruses and spy ware (and sometimes other types of malware as well such as adware) can take advantage of it, resulting in these programs ending up on the visitors computer (if using Windows at the time). Spyware is any piece of software that silently gathers information about a user while he/she navigates the Internet and transmits the information to an individual or company that uses it for marketing or other purposes.Spyware and other types of Malware usually do not target Firefox, but there is some out there that will also get Firefox, but it is rather unlikely that a Firefox user would get it. Unless for example they install loads of extensions from all kinds of web sites. So don't install an add-on if the website doesn't look trustworthy .If a Firefox user has the cache turned on a Trojan can end up in it. A cache is an amount of space in which Firefox uses to temporarily store images and other files from sites so you can load the page up quicker if you chose to go back and view the page again. You can turn it off by going to "Tools" then "options" click on the "advanced" tag and then the "cache" tag set the amount of MB's it's allowed to use to "0". However a Trojan just sit their in the catch and will not do anything unless the user actually opens it.
FIREFOX ADDONS
Add-ons are installable enhancements to the Mozilla Foundation's projects, and projects based on them. Add-ons allow the user to add or augment application features, use themes to their liking, and handle new types of content.So, Add-ons give Firefox many new options and functions. How to get them? www.google.com or mozillas extension site which is at addons.mozilla.org.some useful addons for development & security in my opinion are:
1. GREASE MONKEY:  This allows you to customize the way a web page displays or behaves, by using small bits of JavaScript.
download link:
https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/?src=cb-dl-users
2. FIRE BUG: 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.
download link:
https://addons.mozilla.org/en-US/firefox/addon/firebug
3.RIGHTTOCLICK: It enables right-click, text selection, context-menu, drag&drop and much more where it is disabled by Javascript.RightToClick protects from annoying alert pop-ups, can remove many timer actions and is able to suppress (unusual) click behavior. The highly sophisticated engine also offers options for fine tuning. Finally it's helpful with image downloads (also disabling CSS might be useful here).
download link:
https://addons.mozilla.org/en-us/firefox/addon/righttoclick
p.s- if you have not noticed yet, then let me inform you that you can use this addon in this blog also, try it.
4. NOSCRIPT:This add-on is used for security. It simply blocks malicious scripts, applets and flash. A disadvantage of this is if you want a script to be run on a site when visiting, you must unblock it. To read more about this addon:
http://teamhackaholic.blogspot.com/2011/06/noscript-security-against-active.html
5.ADD-N-EDIT COOKIES:No comment. You know what it does. but this add-on is not available for the 7.0,1 version.
6.ADBLOCK PLUS:The add-on is supported by over forty filter subscriptions in dozens of languages which automatically configure it for purposes ranging from removing online advertising to blocking all known malware domains. Adblock Plus also allows you to customize your filters with the assistance of a variety of useful features, including a context option for images, a block tab for Flash and Java objects, and a list of blockable items to remove scripts and stylesheets.
download link:
https://addons.mozilla.org/en-US/firefox/addon/adblock-plus
7.WEB-DEVELOPER:The Web Developer adds various web developer tools to your browser.
download link:
https://addons.mozilla.org/en-US/firefox/addon/web-developer
8.LIGHT SHOT: if you want a screenshot of a website immediately, then this tool is very useful for you.LightShot is a tool allowing you to easily make screenshots of any selected area in a browser tab.
downloading link:
https://addons.mozilla.org/en-US/firefox/addon/lightshot
9.HACKBAR: Well if you are a web develper and concerned about your website security, then this Add-on is made for you. we have already explained about this add-on in our blog earlier. follow the link to read more:http://teamhackaholic.blogspot.com/2011/06/firefox-hacking-addon-hackbar.html
10.ALL-IN-ONE SIDEBAR:This is made for the ease of the user.All-in-One Sidebar is a wonderful extension that provides you easy access to your bookmarks, downloads, history, themes and extensions, and more.
download link:
https://addons.mozilla.org/en-US/firefox/addon/all-in-one-sidebar
note: all the add-ons are explained keeping in mind that you are using the latest firefox version,i.e. 7.0.1, many security issues and bugs have been patched in this version. Otherwise if you are using the earlier versions of firefox, then many security related add-ons are available which are very important:
some of them are:XSS-ME, SQL INJECT ME etc.


posted by:-DR34MHAXX