Firefox Extensions to GUI Prototyping

Discover Firefox Extensions to GUI Prototyping.

Create user interface prototypes and mockups using a drag-and-drop interface with various pre-built elements.

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Pencil Project

Open Source

Pencil Project is a free and open-source GUI prototyping tool that helps designers and developers create wireframes and mockups easily. Available as a standalone application and a Firefox extension, it offers a wide range of built-in shapes and templates for various platforms.