As of bug 1478124, the new preferred method for registering XPCOM components
is via static manifest files, as documented here:
https://firefox-source-docs.mozilla.org/build/buildsystem/defining-xpcom-components.html
And, as of bug 1524688, it will be the preferred method of defining
JavaScript components as well as native ones.
The primary motivation for this change is to decrease the amount of memory
(and, to a lesser extent, startup performance) overhead that component
registrations consume in content processes, which would not have been
acceptable in the post-Fission world. It has the side-benefit, though, of
making most registrations much more straightforward, requiring only a single
entry, in a single place, for each component.
Thank you to all of the reviewers who had to review a lot of very large
patches to make this possible, particularly Nathan Froyd, Eric Rahm, and
Mike Conley, on whom I dumped most of the biggest chunks.
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