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Hides advertisements from pages
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Integrates Delicious bookmarks with browser
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File download manager built in into Firefox
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Faster navigation by using mouse gestures
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Creates screenshots of web pages (entirely or just visible part). Windows only
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Best browser debugger for your JavaScript, CSS and HTML
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Provides download manager integration for loading multiple web links, saving YouTube videos
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Selectively blocks flash animations
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Switch your browser proxy settings quickly
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If you have a device with smaller screen, such as netbook, this plugin allows you to run Firefox in convenient to use full screen mode. The full screen functionality in Firefox does not provide some functionality
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Allows changing and extention of any web page with custom JavaScript. Has large number of ready to use scripts for improving the look of some popular web sites.
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Online service to store your login passwords and registration form details. I would use it for storing all non-critical accounts. Makes life easier by making automatic login to websites, registration form prefilling and sharing your account details accross multiple computers.
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Displays information about displayed page from SEO perspective
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Makes screenshot of the web page. Not as good as Fireshot, but this one work on Linux.
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WordPress blogging from Firefox (also supports other applications)
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Used for UI testing, but can also be used for scripting repeatable actions. See also Selenium.
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Open source multiplatform file compression tool. Supports all major archive formats and provides both GUI and command line interfaces. Why people are still using WinZip?
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Web Debugging Proxy which logs all HTTP(S) traffic between your computer and the Internet. Allows you to inspect all HTTP(S) traffic, set breakpoints, and "fiddle" with incoming or outgoing data including Internet Explorer, Mozilla Firefox, Opera, and others
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Makes a screehshot of selected area on the screen and allows to make notes directly on the image. A free alternative to SnagIt
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The Open Source Keystroke Launcher. Start your apps quickly without "Start" button
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Open source tool for PDF document creation. Alternative to commercial tools like Adobe Acrobat
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Open source HTTP debugging proxy with extended support for event filtering, replacing HTTP requst/response data on the fly, etc. Could be also used for web site penetration testing and security cheking. Similar to Fiddler in some aspects, but, since its written in Java it is good for both Windows and Linux. Open source
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Advanced monitoring tool for Windows that shows real-time file system, Registry and process/thread activity.
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Web-Harvest is Open Source Web Data Extraction tool written in Java. Uses XSLT, XQuery and Regular Expressions for text and XML manipulation
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Free SFTP and FTP client for Windows. Transfer files from Windows to Linux over secure connection using SSH connection