FrontMotion

Hi,
I am trying the frontmotion packager with a trial version.
I try to upload custom icons and build, but it seem have no effects.
I try to upload an xpi extension but I do not find it when run ff.
Can I found a packager documentation for a correct use?
I'm doing something wrong?

Thanks

If you were trying to build 21.0. There was an issue with extensions that's now been corrected. For the icon, I will post a sample icon file soon to ensure that it looks good and compatible.