There are a bunch of extensions that you can use for fun or for your convenience. But I've marked some that are increasing our productivity, our concentration to our work, and decrease our wasted time.

Image courtesy of veo_
I will list the extensions by Alphabetical order.
Aardvark 2.0
Powerful and user-friendly "selector" utility for selecting elements and doing various actions on them. It can be used for cleaning up a page prior to printing it (by removing and isolating elements), for making the page more readable, and (most appreciated by web developers), for analyzing the structure of a page.
Aging Tabs 0.5.2
Makes unused tabs fade with age and highlights the selected tab.
Ask Power Tools 2.0
Extends Firefox with Ask.com features
BBCodeXtra 0.2.5.6
BBCodeXtra is an extension, compatible with Mozilla FireFox and Mozilla Suite, which adds to the context menu new commands to insert BBCode/Html/XHtml codes in an easy and fast way.
CoLT 2.3.0
CoLT adds two menu items to the browser's context menu, both of which are only visible when right-clicking a hyperlink. The "Copy Link Text" menu item copies a hyperlink's associated text to the clipboard, while the "Copy Link Text and Location" menu item copies both the hyperlink's text and URL to the clipboard in the format you choose: either as plain text, as an
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