Firefox is a new web browser ,the most powerfully competitor for Internet Explorer.The main advantage is because you can add new features through the add-ons options .Add-Ons are improvements developed by third part who have different functionalities.The most popular Firefox addons are Firebug,Adblock Plus,StumbleUpon,Firefox Companion for eBay,Cooliris Previews,ChatZilla and Forecastfox. There are thousands of extensions available for free addition to this browser.

       
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A modern internet browser competing IE. In tools option you can manage Firefox addons.A major advantage is that you can enable or disable any extension installed.If a extension was installed you must restart application before take effect.
Extensions are grouped by category on the developer website (feeds,privacy,bookmarks,language,multimedia,toolbars,tabs,web development etc.). Can choose themes for appearance(Vista-aero,NASA night and others).The dictionaries extensions will translate your pages in the foreign language desired.

You can add quick search window for the most popular search engines and web sites (Ask.com,Lonely Planet,del.icio.us,Wikipedia,Yahoo! Answers etc.)This windows will appear in the right top of your Firefox page.

Plugins are developed by Mozilla for some usefully actions :
- Acrobat Reader will allow to see pdf documents
- Adobe Flash Player will allow to see Flash applications
- Quicktime,RealPlayer,Shockwave and Windows Media Player are designed for improve faster multimedia capabilities while you are surfing the Internet with Firefox.

You can build your personal add-on.Help or documentation is available at http://developer.mozilla.org/en/docs/Extensions . You can block cookies,scripts,undesired advertisement and pop-ups and the intenet navigation is now more easier with this browser.