What extensions/addons do you use in Chrome/Firefox?

[Sunbed]

Just for interest (I use Chrome)...

1. Adblock - You all know what this does
2. Adblock button - Same
3. Lastpass - Password manager and form filler
4. Gmail Checker - Notifies if new mail
5. Better Gmail - Useful Gmail script with minor (but nice) tweaks
6. Goo.gl - Google's URL shortener

 

[no_1_dave]

Using chrome:

IE Tab - Display web pages using IE in a tab
Send from Gmail - Makes Gmail your default email application and provides a button to compose a Gmail message to quickly share a link via email
Translation Bar - This extension translates entire webpages into a language of your choice with one click

 

[theheyes]

Adblock in FF, nothing in Chrome.

 

[mrk]

A few...

Firefox 3.6.3.plugin1 (beta):
Extensions (enabled: 29, disabled: 0; total: 29)

• Adblock Plus 1.1.3
• Add-on Compatibility Reporter 0.4.2
• BBCodeXtra 0.2.6.1
• Better Flickr 0.4.1
• Better Gmail 2 1.1.1
• Chrome View 0.2.0
• CustomizeGoogle 0.76
• FEBE 6.3.2
• FireFTP 1.0.7
• Firesizer 1.0
• Fission 1.0.9
• FxIF 0.4.1
• iGoogle Tab Remover 1.9.5
• ImageShack right-click 0.3.7
• InfoLister 0.10.3
• Locationbar² 1.0.5
• Nightly Tester Tools 2.0.3
• Omnibar 0.6.8.20100227
• Personal Menu 4.3.2
• QuickDrag 2.0.2.1
• Screengrab 0.96.3
• Stylish 1.0.8
• Tabberwocky 1.1
• Text Link 3.1.2009110201
• TinEye Reverse Image Search 0.7.1
• TwentyTenBuddy 1.4
• Undo Closed Tabs Button 3.6.2
• Yet Another Smooth Scrolling 3.0.13

Chrome 5:

FireFTP is too good to ditch Firefox for and on top of that the new technologies FF is shaping up to over the next few nightlies.

 

[subbass]

Adblock
Noscript
Pagezipper - merges all pages like galleries spanning across multiple pages into one, so no more clicking Next a thousand times

 

[Locke]

Just a few as well....

Firefox 3.6.3

Adblock Plus 1.1.3
Adblock Plus: Element Hiding Helper 1.0.6
App Tabs 0.6.2
Battlefield Heroes Updater 4.0.53.0
Cooliris 1.11.7
Firebug 1.5.3
FireFTP 1.0.7
Fission 1.0.9
FoxyProxy Standard 2.19.1
Gmail Notifier 0.6.4.1
Illimitux 4.0
Java Console 6.0.18
Logitech Device Detection 1.0.176.0
Nightly Tester Tools 2.0.3
NoScript 1.9.9.61
Password Exporter 1.2
Rehost Image 1.3.7
ReloadEvery 3.6.2
Save Image in Folder 1.3.1
Smart Bookmarks Bar 1.4.3
Tabberwocky 1.1
Text Link 3.1.2009110201
TinEye Reverse Image Search 0.7.1
TwentyTenBuddy 1.3
UrlbarExt 1.6.1
Web Developer 1.1.8
WebMail Notifier 2.3.3
Xmarks 3.5.7
Yet Another Smooth Scrolling 3.0.13


EDIT: Just stole Quick Drag and Undo Closed Tabs from Khaaaaaaan

 

[That Guy]

Using Firefox 3.6.3 on Windows 7 and have the following Add-ons:

British English Dictionary
Real Time Spell Checking.

New Tab Homepage
Opens your homepage when you open a new tab.

ScreenGrab
Grabs a screen shot of whole webpage and saves as PNG.

SearchPreview
Preview pages in Google Search Results.

SmoothWheel
Smooth scrolling on web pages using your mouse wheel.

Swoosty SEO Tools
View PageRank, AlexaRank and More.

Total Validator
Validate and Fault Find websites you are creating.

TwentyTenBuddy
Make your Firefox look like the Firefox 4 mockups.