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Note the high priority - Firefox should be installed before plugins, like [[Flash Player|Macromedia Flash Player]] or [[Authorware Player|Macromedia Authorware Player]] etc.
As the Firefox install now nicely upgrades and doesnt doesn't leave the old one into in the registry, there is no need to differentiate versions in package id.
When a new major version comes out, just replace every occurrence of 1.5 with 1.5.1 (for example) and then increment the package revision number.