Mozilla Top 5 addons..

Though there are a lot of add-ons available out there, Some add-ons are mandatory and useful too...
First you must stop using Internet Explorer and choose the one and only Firefox. Ignite the web using Firefox 2.

The list goes like this

1. STUMBLE UPON
The God of mine, guys if u dont know how to make a proper use of de so called internet just give this a try. Its damn simple just get yourself registered in the above link and the respective add-on. You can see the time flying off.Its absolutely nice to use stumble upon. You can choose the categories according to your interest and surf on the websites which you like. Actually it just generates the top ranked pages of Google according to the tags of interest.

2.FIREBUG
Being a blogger, you are always interested in customizing the looks etc etc. Firebug is the best to choose. Its just a simple tool using which you can inspect each and every element in your source code. It also lists out the DOM structure of each and every element present in the source code. It helps you to customize webpages too. You can change the width height etc to any size and reciprocate the same in the source code later.

3.GREASE MONKEY
This is the all time favourites of all Firefox users. Its an add-on in which you can write some java scripts and save it corresponding to some domain name. Each time the domain gets loaded, the java script gets executed. If you dont know to write java scripts, no worries. All you have to do is just visit userscripts website. Else Google on the book dive in to grease monkey. This will be very helpful to you. Helps in customizing all the things in the internet.

4.WEB DEVELOPER
Another best add-on for web developers out there, this installs a tool bar in which you can play with disabling CSS and edit it according to your wish. It has many other options like display images, edit it accordingly etc etc

4.DOWNLOAD STATUSBAR
View your downloads infor in a tidy statusbar - without the download window getting in the way of your web browsing.

5.Foxy Tunes
Another nice add-on which integrates the mp3 toolbar of any players by selecting the respective options. Without shifting to winamp just stop,play pause etc...

More add-ons are available. The above here are the top 5 (Rated by me).