To install the CLI and Iceweasel/Firefox addon, run (requires 'gzip' and 'zip'): make -C cli sudo make -C cli install make -C xul-ext ../icevault@guilhem.org.xpi cp icevault@guilhem.org.xpi ~/.mozilla/firefox/*.default/extensions However users familiar with Debian packaging will probably prefer to build their own package: git checkout debian AUTO_DEBSIGN=no git buildpackage --git-force-create VERSION=$(sed -nr '/^icevault \(([^)]+)\).*/ {s//\1/p;q}' debian/changelog) sudo dpkg -i ../icevault_${VERSION}_all.deb ../xul-ext-icevault_${VERSION}_all.deb (Add the option '--git-upstream-tree=BRANCH' to the 'git buildpackage' command to package the development version rather than the last tagged release.)