It explains how to add Add-ons from files (mouse-over on the Download button). Icedove/iceowl Add-on search has an option for installing from a file.
Leveraging Debian to build an "open" app store for jailbroken iPhone.
Copyleft is not doing worse. At least in Debian.
If you haven't started the process of moving to a new GPG key, you should probably read this.
Which GNU/Linux distributions are are based off of which other GNU/Linux distributions?