List of useful addons for FireFox (with links) Part 1

 Addons for firefox (3.6.10)

+ Pixlr Grabber

Description: Making screen grabs and pulling down images from the web just got a bit more easy. With the Pixlr grabber add-on you can choose to Edit, Share, Save or Copy your final grabs. You also get the possibility to right-click any image or background to edit
Download: Add to Firefox

+ ClickCutter AutoCopy

Description:
Highlight a text and automatically Copy it to the clipboard.

Based on unique Smart Autocopy technology!
You have full control of what to copy and what not to copy when you highlight text.
Middle button Paste option.
Super-easy.
Download: Add to Firefox

+ ClickCutter AutoSearch

Description:
Highlight text and AUTOMATICALLY SEARCH it in your favorite search site.

Includes:
- Automatic Copy of highlighted text (AUTOCOPY)
- Automatic websearch for highlighted text (AUTOSEARCH).
- Middle button Paste
NO annoying context menus !
Download: Add to Firefox

+ Lizardtech DjVu (Many rare ebooks are available in this format)

Description:
DjVu is a web-centric format and software platform for distributing documents and images. DjVu can advantageously replace PDF, PS, TIFF, JPEG, and GIF for distributing scanned documents, digital documents, or high-resolution pictures. DjVu content downloads faster, displays and renders faster, looks nicer on a screen, and consume less client resources than competing formats. DjVu images display instantly and can be smoothly zoomed and panned with no lengthy re-rendering. DjVu is used by hundreds of academic, commercial, governmental, and non-commercial web sites around the world.
DjView4 is a new portable DjVu viewer and browser plugin.
Download:
http://djvu.sourceforge.net/

+ All In One Gestures

Description:
This extension allows you to execute common commands using mouse gestures, rocker navigation, scroll wheel navigation and page..
Download: Add to Firefox

+ All In One Sidebar

Description:
AiOS lets you open various windows as sidebar panels, and quickly switch between them. So it put an end to the window chaos! In addition to bookmarks and history it opens dialogues such as downloads, add-ons and more in the sidebar.
Download: Add to Firefox

+Wikipedia Lookup Add-on

Description:

Looks up up the selected word in the Wikipedia encyclopedia in the language specified in your user preferences.
Download: Add to Firefox

+ CHMReader

Description:
An extension to make firefox support Compiled HTML(.chm) file.
Download: Add to Firefox

+ ClipMarks

Description:
Clipmarks lets you clip and share specific parts of articles, blog posts or anything else you read on the web. With our newly integrated Amplify service, you can post clips directly to Twitter or Facebook - or share them on clipmarks.com and more.
Download: Add to Firefox

+ ColorfulTabs

Description:
The most beautiful yet the simplest add-on that makes a strong colorful appeal. Colors every tab in a different color and makes them easy to distinguish while beautifying the overall appearance of the interface. For Seamonkey & Flock. An essential.
Download: Add to Firefox