Five add-ons

The first add-on to Firefox that I installed was "About this Site".

https://addons.mozilla.org/en-US/firefox/addon/3673

This add on lets you find out info about who owns a web site, how many people visit the website and much more info! I would recommend this plugin/addon to Firefox!

http://www.stumbleupon.com/

The next add-on was "Stumble Upon". StumbleUpon is an AWESOME way to meet people with similar interests and discover great web pages. You wouldn't believe how many cool websites I've discovered and how many DAYS I've spent with SU.

http://fireftp.mozdev.org/

The third ad-on I added to Firefox was FireFTP. This has became an invaluable part of my Internet web browsing. Now I have instant access to my FTP server. NO NEED TO bring a flash drive when I have my ftp access. :)

https://addons.mozilla.org/en-US/firefox/addon/1843

Firebug is one add-on I don't use very often. It's geared towards web developers (a hobby of mine) and I have found it useful to examine the source code of web pages...but it is an add-on I don't consider vital. It's more of a novelty.

https://addons.mozilla.org/en-US/firefox/addon/2207

Cooliris is a cool ad-on that allows you to preview a web page before you click on a link. What a cool time saver! I enjoy this add-on for Firefox a great deal!

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See? The reviews don't have to be very long!