I wanted a pdf creator for web pages so i searched and installed some. I removed them as soon as i knew of the limitations of their output and settings. Then i tried this one (PDF Mage) which turns out to be great addon. It's free and no limitations for settings. I hope the developer improves this addon some more.

Works great...when it works. About 1/2 of the screenshots saved to PDF format result in an error condition, with the add-on puking with no error messages. Have had to rely on *other* PDF screen capture utilities.