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→A single service and service versioning
If a service is already installed, the service will be replaced on updates and installs only if it is newer than what is installed. This means that if a user has Nightly installed, the Nightly service will be used to update all channels.
If the user is running on an x64 computer with a native x64 build, then the service will not be installed nor used by that build. If the user is on an x64 computer with an x86 build, then the service will be used and installed by the build as an x86 process. Future versions of Firefox will support native x64 builds with the service. Work is being tracked for native x64 builds in [https://bugzilla.mozilla.org/show_bug.cgi?id=715876 Bug 715876].
The service decides whether or not it is newer by looking at the updater file's version number in comparison to a new one being updated/installed.
