The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.
The Web Developer extension adds various web developer tools to the browser.
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.
Finds HTML elements matching chosen CSS selector(s) or XPath expression
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.
Dust-Me Selectors is development tool to remove unused CSS selectors.
Allows you to disable and enable or manually flush the DNS Cache of Firefox (Notice: This addon is no longer maintained. If you'd like to update it for newer Firefox versions check out the Github repo: https://github.com/djungowski/ff-dnscache)
Pagediff is a simple page compare application. It helps web developers and designers to see HTML-code(text) differences between web pages...
One can visit my site to download new version(new versions before release)
Collections are groups of related add-ons that anyone can create and share.Explore Collections