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I am trying to use pencil for my wire frames yet it is not compatible with FFox 16.0.1. What can I do??

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Pencil Project is not working as needed. Maybe the pencil project has not caught up to the updates of the FF browser.

Pencil Project is not working as needed. Maybe the pencil project has not caught up to the updates of the FF browser.

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Is this an extension? Have you tried opening the .xpi file with an archive handler like Betterzip or Zipeg, extracting the install.rdf file, and increasing the max version number for the target application? After you edit that, save the file, then insert it back into the archive and save it, then reinstall it.