As a developer I spend a lot of time with cool Firefox add-ons like Web Developer and Firebug. Today I found another great add-on which lets you create mock screens. It is called Pencil brought to you by The Pencil Project. Like all other add-ons it is freely available. Once you have installed it you are ready to go. Currently it comes with some common Window XP like widgets which are most commonly used in mock screens.

Mock screens produced by Pencil can be exported to png format. Quality of mocks produced is also superior than some other programs I have worked with. This is a great little tool for developers.

Definitely something to be proud of. Mozilla has confirmed their entry into Guinness Book Of World Records for the largest number of software downloads in 24 hours. According to their site Firefox3 was downloaded 8,002,530 times on 18th June, 2008.