This Collection is for Extension developer and who want to hack the mozilla.
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.
As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.
A suite of tools for developers.
Inspect the DOM of HTML, XUL, and XML pages, including the mail...
Collections are groups of related add-ons that anyone can create and share.Explore Collections