Best Firefox Extensions for Power Users 
Which ones do you use and recommend? Let's make a list of the best extensions so users will not need to search and test around the extensions.
Resources
Essential tools for any web developer. Too many to mention here.
"Greasemonkey is a Firefox extension which lets you to add bits of DHTML ("user scripts") to any web page to change its behavior. In much the same way that user CSS lets you take control of a web page's style, user scripts let you easily control any aspect of a web page's design or interaction."
The development of Adblock pretty much stopped in 2004. When more and more people demanded improvements Adblock Plus was created. Adblock Plus is a completely rewritten version of the original Adblock.
Loads of Tab improvements. Changing the behavior of tab opening, focus, closing, mouse events on tab and much more. One of the best tab extensions around!
IE Tab allows embedding Internet Explorer in tabs of Mozilla and Firefox.
This extension automatically fills in login forms from a list of username and passwords collected from bugmenot.com. With this, you can bypass registrations on websites that you would not like to be registered with will still being able to access their content.
"StumbleUpon uses ratings to form collaborative opinions on website quality. When you stumble, you will only see pages which friends and like–minded stumblers have liked."
This extension allows you to automatically keep up to date Adblock or Adblock+ with G's latest filterset every 4-7 days. It also provides you with the ability to define your own filters that you want to persist between updates.
"Adblock is a content filtering plug-in for the Mozilla and Firebird browsers. It is both more robust and more precise than the built-in image blocker."
Download Statusbar is a browser extension that allows you to keep track of ongoing and completed downloads in a hide-away statusbar.
The power downloader: lets you download in just one click links, images or other selections contained in a webpage.
"SessionSaver restores your browser -exactly- as you left it, every startup, every time. Not even a crash will phase it. Windows, tabs, even things you were typing -- they're all saved."
ScrapBook is a Firefox extension, which helps you to save Web pages and easily manage collections. Key features are lightness, speed, accuracy and multi-language support. Major features are:
* Save Web page
* Save snippet of Web page
* Save Web site (In-depth Capture)
* Organize the collection in the same way as Bookmarks tree
* Highlighter, Eraser and various page editing tools
* Full text search and quick filtering search
* Text edit feature resembling Opera's Notes
Allows you to execute commands by moving the mouse around.
"This is a Firefox extension that allows you to manage multiple gmail accounts and receive new mail notifications. Displays account details including unread messages, saved drafts, spam messages, labels with new mail, space used, and new mail snippets."
It enhances Google search results by adding extra information (like links to Yahoo, Ask Jeeves, MSN etc) and removing unwanted information (like ads and spam).
Use and eyedropper tool to find the color of any point in your browser.
"FlashGot turns every supported download manager in a download manager for Firefox"
Gives a nice weather forecast in the lower right hand corner of Firefox.
A good replacement for Google's notifier, this extension adds a statusbar item showing if you have new email. You can configure the time between checks for new email.
HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of errors of a HTML page is seen on the form of an icon in the status bar when browsing. The details of the errors are seen when looking the HTML source of the page.
Manage a lot of things through the Firefox sidebar, create new toolbars, etc.
NoScript provides extra protection for your Mozilla/Firefox or Flock browser: this extension allows JavaScript and Java execution only for trusted domains of your choice.
FoxyTunes is an Extension for Mozilla Firefox. It also supports the Mozilla Suite and Mozilla Thunderbird. It allows you to control your favorite media player without leaving the browser. The controls are positioned on the status bar or one of the toolbars, so no extra space is wasted.
A beautifully simple CSS property viewer - hover over any element to see its properties
Drag a link (e.g. google ), text-link (e.g. http://www.google.com ), text-uri (e.g. abc.com ), image , or bookmark quicklink from bookmarks toolbar folder and throw it anywehere on your webpage (content area) to open it on a new tab.
The Aardvark Firefox extension is a tool for web developers/designers providing the opportunity of viewing and editing styles (css) and content of the page elements ... Things You Can Do With Aardvark : Clean up unwanted banners and surrounding "fluff," especially prior to printing a page ... See how the page is created, block by block ... View the source code of one or more elements and more ... one of my very favorite ...
Notifies you when updates are available for your extensions and themes. Easily configurable for automatically installing updates when available and checking for updates when Firefox starts.
Full-featured, free (charityware) FTP client that runs as a Firefox extension.
Adds "Restart Firefox" menuitem to "File", and a toolbar button for easy restarting. Great for when you install themes or extensions and need to restart Firefox.
Foxylicious is a Mozilla Firefox extension that syncs your del.icio.us bookmarks into your browser bookmarks.
Enhanced console and DOM inspector for great web development.
"Performancing for Firefox is a full featured blog editor that sits right within Firefox. Just hit F8 or click the little pencil icon at the bottom right to bring up the blog editor and easily post to your Wordpress, MovableType or Blogger blogs."
Best. Web Safety. Extension. Ever.
They trolled 95% of the world's web traffic and tested e-mail registration forms with unique e-mail addresses for spam and downloads for spyware.
Mindboggling - and free. =)
Fleck let's you add notes and comment to every page on the web. Blog or share your annotated pages. Comarking (commenting and Bookmarking in one) is what they call it. no account needed!
Interactive removal of page elements through Greasemonkey.
This extension allows you to execute common commands using mouse gestures, rocker navigation, scroll wheel navigation and page scrolling.
Rearrange or remove menuitems from the main context menu (right-click menu) and main menubar (File, Edit, View, etc.).
Showcase is an extension thought to easily locate and select any open browser window in Firefox. Press F12, and it generates a page with the small thumbnails of opened webpages. (Like in IE7 :)
"...lets you paste an URL from the clipboard into the address bar and load it as a single step, either via the adress bar's context menu or by pressing Ctrl-Shift-V. Similarly, you can "Paste and Search" via the search bar's context menu or Ctrl-Shift-S."
Adds zoom functionality for images. Easily zoom in, zoom out, fit image to screen or set custom zoom on individual images within a web page.
Adds a menu and a toolbar button to switch the user agent of the browser.
View HTTP Headers on the fly. Extremely helpful for debugging web applications.
If you’ve ever had to re-install Firefox, or you’re installing Firefox for the first time on a new computer, you know it can be a pain to hunt down and install your favorite extensions. The Mass Installer extension reads a list of extension URLs from a text file and automatically installs them all in one fell swoop.
Operator lets you combine pieces of information on Web sites with applications in ways that are useful. For instance, Flickr + Google Maps, Upcoming.org + Google Calendar, Yahoo! Local + your address book, Delicious + Answers from Yedda, and many more possibilities and permutations. All of these scenarios are possible due to Microformats, an emerging standard for injecting semantics into HTML.
Instantly find related sites with one click of the button. Great way to discover new information online as well as effortlessly find what you are looking for.
Flashblock is an extension for the Mozilla, Firefox, and Netscape browsers that takes a pessimistic approach to dealing with Macromedia Flash content on a webpage and blocks ALL Flash content from loading. It then leaves placeholders on the webpage that allow you to click to download and then view the Flash content.
Enhanced version of the popular Forecastfox extension. This adds 12 improved radar images and the ability to supply a URL for your own radar image. It also allows for pausing, restarting and setting the frequency of automatic updates.
"We test the Web to help keep you safe from spyware, spam, viruses and online scams."
Draw out a ruler to get the pixel width and height of any elements on a webpage.
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Great resource for learning more about energy deregulation
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Web hosting directory providing details on a number of hosting companies and their plans.
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Your source for advice on how to get the most out of FF extensions.
Extra (customizable) keyboard shortcuts and macros for Gmail.
Check your site rank for major terms on several search engines, right from your browser.
Award winning Toolbar / firefox extension for Designers, Animators and Graphic artists.
This extension allows you to get the following information about any URL in Firefox:
- Rankings information (Google PageRank, Alexa rank, Compete.com rank, Technorati rank)
- IP address information (IP, network name & range, country)
- Linking information (indexed pages count, inbound links count, etc.)
- Server response headers
- Page information (title, meta tags, size)
- This page in social networks (del.icio.us, digg.com)
- Domain whois information (domain nameservers, registrant & owner information)
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This is a cut down version of IE View by Paul Roub, which is 47.4 KB. All the same UI and features are there. It has a right click menu item to open a page in IE and a list of sites to always open in IE. Everything's just been rebuilt from the ground up to be smaller and more efficient. Plus, it has the ability to pass extra parameters to the executable (very helpful for use with WINE), which is not included in regular IE View.
As you type spell check in every text fields. Supports all the dictionaries provided by mozilla.
Select text and it's automaticaly copied to the clipboard, like Trillian or mIrc.
Allows you to add bookmarks to any folder in the bookmarks menu like in Opera.
This is a brand new Firefox extension that allows you to create a backup of all your installed extensions and themes. The backups are created in an installable xpi format so you can easily port them to another computer.