The Web Developer extension adds various web developer tools to the browser.
Use the Evernote Web Clipper to save things you see on the web into your Evernote account.
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
When you find something on the web that you want to view later, put it in Pocket. It automatically syncs to your phone, tablet or computer so you can view it at any time, even without an internet connection.
Personas are free, easy-to-install "skins" for Firefox. Personas Plus extends that built-in functionality to give you even more control and easier access to new, popular, and your own favorite Personas.
TinEye is a reverse image search engine. The plugin adds a context menu item that allows you to search for an image to find out where it came from, how it is being used, if modified versions of the image exist, or to find higher resolution versions.
With the bit.ly Preview Plugin for Firefox, whenever you hover over a bit.ly URL on any web page, we display a tooltip showing the Page Title, Long URL, and any Click Data we have about the page the URL links to. If you hover over another short URL,h...
As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.
Show the IP address of the current page in the status bar. It also allows querying custom information services by IP (right click) and see location and avaiable vouchers for shopping sites. Additionally you can copy the IP address to the clipboard.
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