With al of the updating of Firefox the past day or so I was forced in to also finding updated versions of some of my extensions and add-ons. While I was in there I realized that this is the greatest thing about Firefox and I should share with everyone. Maybe they'll help someone and it would be cool to hear any that other people are running.
Adblock Plus
Adblock Plus 1.3.3
Adblock Plus allows you to regain control of the internet and view the web the way you want to. The add-on is supported by over forty filter subscriptions in dozens of languages which automatically configure it for purposes ranging from removing online advertising to blocking all known malware domains. Adblock Plus also allows you to customize your filters with the assistance of a variety of useful features, including a context option for images, a block tab for Flash and Java objects, and a list of blockable items to remove scripts and stylesheets.
Add to Search Bar
Make any pages' search functionality available in the Search Bar (or "search box")...
FEBE
FEBE (Firefox Environment Backup Extension) allows you to quickly and easily backup your Firefox extensions. In fact, it goes beyond just backing up -- It will actually rebuild your extensions individually into installable .xpi files. Now you can easily synchronize your office and home browsers.
***Note - This one is still in Beta stage since the release of Firefox 4. Use at your own risk.***
Greasemonkey with Rapidshare Link Checker
Customize the way a web page displays or behaves, by using small bits of JavaScript.
Rapidshare Link Checker Script Summary:
Automatically check links from more than 50 file hosts including rapidshare.com, megaupload.com, hotfile.com, filefactory.com and others directly from the page that you are visiting.
NoScript
The best security you can get in a web browser!
Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.
Password Exporter
This extension allows you to export your saved passwords and disabled login hosts using XML or CSV files that can be imported in another browser or computer.
Paste Quote
Inserts [ quote ] tags around the clipboard contents when you right click and 'Paste Quote'.
pwgen - Password Generator
For Sysadmins / Network Engineers / and why not everybody who needs a quick password generator.. simple, yet efficient
Screengrab
Screengrab! saves webpages as images...
It will capture what you can see in the window, the entire page, just a selection, a particular frame... basically it saves webpages as images - either to a file, or to the clipboard. It captures Flash too!
ShowIP
Show the IP address(es) of the current page in the status bar. It also allows querying custom services by IP (right mouse button) and hostname (left mouse button), like whois, netcraft. Additionally you can copy the IP address to the clipboard. This extension was formerly known as ipv6ident.
Undo Closed Tabs Button
***Note - Mozilla has not yet approved the updated version of this add-on. Therefore it must be downloaded from the following link:***
WebMail Ad Blocker
Block ads on the right hand side of the screen when using Yahoo Mail, Hotmail and Gmail thereby expanding your message space. A children friendly solution for removing nudity and annoying advertisements.

Adblock Plus
Adblock Plus 1.3.3
Code:
https://addons.mozilla.org/en-US/firefox/addon/adblock-plus/
Adblock Plus allows you to regain control of the internet and view the web the way you want to. The add-on is supported by over forty filter subscriptions in dozens of languages which automatically configure it for purposes ranging from removing online advertising to blocking all known malware domains. Adblock Plus also allows you to customize your filters with the assistance of a variety of useful features, including a context option for images, a block tab for Flash and Java objects, and a list of blockable items to remove scripts and stylesheets.

Add to Search Bar
Code:
https://addons.mozilla.org/en-US/firefox/addon/add-to-search-bar/
Make any pages' search functionality available in the Search Bar (or "search box")...

FEBE
Code:
http://softwarebychuck.com/febe/febe70.html
FEBE (Firefox Environment Backup Extension) allows you to quickly and easily backup your Firefox extensions. In fact, it goes beyond just backing up -- It will actually rebuild your extensions individually into installable .xpi files. Now you can easily synchronize your office and home browsers.
***Note - This one is still in Beta stage since the release of Firefox 4. Use at your own risk.***

Greasemonkey with Rapidshare Link Checker
Code:
https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/
Code:
http://userscripts.org/scripts/show/9467
Customize the way a web page displays or behaves, by using small bits of JavaScript.
Rapidshare Link Checker Script Summary:
Automatically check links from more than 50 file hosts including rapidshare.com, megaupload.com, hotfile.com, filefactory.com and others directly from the page that you are visiting.

NoScript
Code:
https://addons.mozilla.org/en-US/firefox/addon/noscript/
The best security you can get in a web browser!
Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.

Password Exporter
Code:
https://addons.mozilla.org/en-US/firefox/addon/password-exporter/
This extension allows you to export your saved passwords and disabled login hosts using XML or CSV files that can be imported in another browser or computer.
Paste Quote
Code:
https://addons.mozilla.org/en-US/firefox/addon/paste-quote/
Inserts [ quote ] tags around the clipboard contents when you right click and 'Paste Quote'.

pwgen - Password Generator
Code:
https://addons.mozilla.org/en-US/firefox/addon/pwgen-password-generator/
For Sysadmins / Network Engineers / and why not everybody who needs a quick password generator.. simple, yet efficient

Screengrab
Code:
https://addons.mozilla.org/en-US/firefox/addon/screengrab/
Screengrab! saves webpages as images...
It will capture what you can see in the window, the entire page, just a selection, a particular frame... basically it saves webpages as images - either to a file, or to the clipboard. It captures Flash too!
ShowIP
Code:
https://addons.mozilla.org/en-US/firefox/addon/showip/
Show the IP address(es) of the current page in the status bar. It also allows querying custom services by IP (right mouse button) and hostname (left mouse button), like whois, netcraft. Additionally you can copy the IP address to the clipboard. This extension was formerly known as ipv6ident.

Undo Closed Tabs Button
Code:
https://addons.mozilla.org/en-US/firefox/addon/undo-closed-tabs-button/
***Note - Mozilla has not yet approved the updated version of this add-on. Therefore it must be downloaded from the following link:***
Code:
http://unclassified.de/tmp/undoclosedtabsbutton-3.7.1-yg.1.xpi

WebMail Ad Blocker
Code:
https://addons.mozilla.org/en-US/firefox/addon/webmail-ad-blocker/
Block ads on the right hand side of the screen when using Yahoo Mail, Hotmail and Gmail thereby expanding your message space. A children friendly solution for removing nudity and annoying advertisements.