And Here's My List of Add-Ons...
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Firefox Version: 3.5.3
1- Colorful Tabs v3.9.3 : Colorful Tabs colors every tab in a different color and makes them easy to distinguish.
https://addons.mozilla.org/en-US/firefox/addon/1368
2- Download Statusbar v0.9.6.5 : View and manage downloads from a tidy statusbar.
https://addons.mozilla.org/en-US/firefox/addon/26
3- Download Helper v4.6.2 : Download videos and images from many sites.
https://addons.mozilla.org/en-US/firefox/addon/3006
4- DownThemAll! v1.1.4 : The Mass Downloader for Firefox.
https://addons.mozilla.org/en-US/firefox/addon/201
5- Fast Dial v2.23b1 : Visual Bookmarks.
https://addons.mozilla.org/en-US/firefox/addon/5721
6- FlagFox v3.3.15 : Displays a flag depicting the location of the current server.
https://addons.mozilla.org/en-US/firefox/addon/5791
7- FoxyTunes v3.5.9.1 : Control any media player from Firefox.
https://addons.mozilla.org/en-US/firefox/addon/219
8- Google Preview v3.22 : Inserts website previews in Google and yahoo search results.
https://addons.mozilla.org/en-US/firefox/addon/189
9- Kaspersky URL Advisor v9.0.0.463
10- Lazarus: Form Recovery v2.0.4 : Recovers lost forms with a single click.
https://addons.mozilla.org/en-US/firefox/addon/6984
11- Minimize to Tray v0.5 : minimizes windows into the system tray.
https://addons.mozilla.org/en-US/firefox/addon/12581
12- NoScript v1.9.8.8
https://addons.mozilla.org/en-US/firefox/addon/722
13- Personas for Firefox v1.2.2 : Themes, Skins and more.
https://addons.mozilla.org/en-US/firefox/addon/10900
14- StumbleUpon v3.38 : Stumble Upon Toolbar.
https://addons.mozilla.org/en-US/firefox/addon/138
15- TabScope v0.2.2.11 : Preview and navigate tab contents through popup.
https://addons.mozilla.org/en-US/firefox/addon/4882
16- United States English Dictionary v3.0.3.
https://addons.mozilla.org/en-US/firefox/addon/3497
17- Update Notifier v0.1.55 : Notifies you when updates are available for your extensions and themes.
https://addons.mozilla.org/en-US/firefox/addon/2098
18- Webmail Notifier v1.4.6 : Notifies your Webmails.
https://addons.mozilla.org/en-US/firefox/addon/4490
... And I Don't Know how my Firefox still starts in 1 Sec. :P