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Webfonts Previewer
A Firefox add-on that allows previewing a website with the fonts available in the Google's font directory...
Kindle Previewer
Preview Kindle books and make the appropriate adjustments....
Animation Previewer
Helps you preview animations before creating the final sprite sheet...
Kindle Previewer 3
This app enables you to preview how your books will appear on Kindle eReaders....
Link Queue & Preview Sidebar
A Firefox extension that displays a sidebar for memorizing links as you find them...