This Collection is for Extension developer and who want to hack the mozilla.
The Web Developer extension adds various web developer tools to the browser.
The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.
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