Firefox Add-ons that I use!!

Listed are the firefox add-ons that I have been using for some time & I think browsing without them now would be impossible!!

All-in-One Sidebar
All-in-One Sidebar (AiOS) is a sidebar control, inspired by Opera's. Click on the left edge of your browser window to open the sidebar and get easy access to all your panels. It lets you quickly switch between sidebar panels, view dialog windows such as downloads, add-ons, and more in the sidebar, or view source code or websites in the sidebar. It includes a slide-out button and a toolbar, all of which can be extensively customized.

Classic Compact Options
To unlock the full potential of Classic Compact and all of the optional settings (including Firefox 2.0 toolbar buttons, the new keyhole arrows, OS native scrollbars, support for dark OS background colors and more), install the companion extension "Classic Compact Options" which can be downloaded from the official Firefox Add-ons site.

Colorful Tabs

DownThemAll!
DownThemAll (or just dTa) is a powerful yet easy-to-use Mozilla Firefox extension that adds new advanced download capabilities to your browser. DownThemAll lets you download all the links or images contained in a webpage and much more: you can refine your downloads by fully customizable criteria to get only what you really want. DownThemAll is all you can desire from a download manager: it features an advanced accelerator that increases speed up to 400%, it allows you to pause and resume downloads at any time and, last but not least, it's fully integrated into your favorite browser!

Fission
Fission combines address bar and progress bar - Safari style, as did Fusion:

FoxClocks
FoxClocks is simple but powerful: if you like, you can just have your local time in your statusbar. Or you can keep an eye on the time around the world with multiple clocks. You can set each clock's colour individually, or have a clock change colour during certain hours: for example you can make your Tokyo clock turn green when it's a good time to Skype your friends in Japan.

Foxmarks Bookmark Synchronizer
Foxmarks is a free add-on for your browser that syncs and backs up your bookmarks across multiple computers and more.

Gmail Notifier
Allows checking for new Gmail messages for multiple Gmail accounts directly from the browser's UI. A status bar item will show once installed, and a toolbar item can be added by customizing the toolbar.

Tab Mix Plus
Tab Mix Plus enhances Firefox's tab browsing capabilities. It includes such features as duplicating tabs, controlling tab focus, tab clicking options, undo closed tabs and windows, plus much more. It also includes a full-featured session manager

Tab Scope
Tab Scope is a Firefox extension which enables you to preview and navigate tab contents through popup. Major features are:

Tweak Network
Firefox has a couple of hidden network settings. With this extension, you can tweak these settings, and you might be able to speed up the loading of web pages. You can also increase the maximum number of simultaneous downloads from a site (the default is only four).