1 Aging Tabs: This add on is great if you are a Firefox user that opens a lot of tabs.  Tabs fade away in colour if they are not being used.
Link: https://addons.mozilla.org/en-US/firefox/addon/3542

2 DownThemAll: A download manager and accelerator that works within the Firefox browser.
Link: https://addons.mozilla.org/en-US/firefox/addon/201

3 Flashblock: Some websites are full of flash video and you may not want these to automatically play.
Link: https://addons.mozilla.org/en-US/firefox/addon/433

4 Image Zoom: Great if you need to zoom in our out on images.  To zoom in or out on an image you can simply hover over an image and press down the right mouse button and scroll up or down with the scroll wheel.
Link: https://addons.mozilla.org/en-US/firefox/addon/139

5 NoScript: Used as a security measure and if you do not want javascript to run on certain webpages.
Link: https://addons.mozilla.org/en-US/firefox/addon/722

[Bonus] 6 ImgLikeOpera:
The Opera browser has a great feature where you can turn off images, get this feature in Firefox with this add-on.
Link: https://addons.mozilla.org/en-US/firefox/addon/1672

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