Because older versions of Firefox auto-select a profile if there is only one in
the database when running dev-edition which uses its own profile we create a
default for normal channels to use. Currently the browser code is responsible
for doing this but it uses a bad heuristic for deciding when to do that. It's
much easier to do it from the profile manager when the dev-edition profile is
created.
Differential Revision: https://phabricator.services.mozilla.com/D16117
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extra : moz-landing-system : lando
961eb5b518