Colorful Tabs

Colorful Tabs is an extension to color every Firefox tab in a different color in order to make them easy to distinguish, while beautifying the overall appearance of the interface. An essential if you're a Mozilla Firefox user.

https://addons.mozilla.org/firefox/1368/

Quick Thumbnail

Quick Thumbnail is the fastest way to resize your pictures and images. Choose an image file, select some resize options, and hit Resize It. Your image will be uploaded to the server, resized and then any or all of the resized images. Not only can you get simultaneous generation of different sizes, but you can enlarge your images, too.

http://quickthumbnail.com/