الإضافات

The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.

View HTTP headers of a page and while browsing.

As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.

Venkman is the code name for Mozilla's JavaScript Debugger. Venkman aimed to provide a powerful JavaScript debugging environment for Mozilla based browsers.