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As the Firefox installer now nicely upgrades and doesn't leave the old one in the registry, there is no need to differentiate versions in "package id".<br>
When a new major version comes out, just replace every occurrence of the version number in the installer file from, e.g. 1.5 .0.4, with, for example, e.g. 1.5.0.5 and then increment the package revision number.
<package