The Web Developer extension by Chris Pederick adds a menu and a toolbar to the browser with various web developer tools. It is designed for Firefox, Flock and Seamonkey, and will run on any platform that these browsers support [...]

Palette Grabber by  Konstantine Prevas is a Firefox extension for web designers. It adds an “Export color palette” command to your Tools menu; selecting this command will extract a color palette for the current page and export it to a Photoshop/Illustrator color palette file. It’s useful for creating mockups of new designs which share a [...]

FireShot by susbox is a Firefox extension that creates screenshots of web pages (entirely or just visible part).
Unlike other extensions, this plugin provides a set of editing and annotation tools, which let users quickly modify web captures and insert text annotations and graphical annotations. Such functionality will be especially useful for web designers, testers and [...]

TwitterBar by Christopher Finke allows you to post to Twitter from Firefox’s address bar. A small Twitter icon sits to the right of your address bar; clicking on it will post your tweet, and you can hover your mouse over it to see how many characters you have left.
You can also post by typing “–post” [...]

ColorZilla by Alex Sirota is an extension for Mozilla Firefox and the Mozilla Suite.
It assists web developers and graphic designers with color related tasks – both basic and advanced.
With ColorZilla you can get a color reading from any point in your browser, quickly adjust this color and paste it into another program. You can Zoom [...]