[Pkg-mozext-maintainers] Bug#920881: webext-debianbuttons should list firefox-esr as first dependency alternative

[Adrian Bunk]

Package: webext-debianbuttons
Version: 2.2-1
Severity: serious

* Migration status: Blocked. Can't migrate due to a non-migratable dependency. Check status below.
* Blocked by: firefox

The problem is:
  Depends: firefox (>= 50) | firefox-esr (>= 50)

The first alternative is special, since it is preferred
by package managers. It should therefore be the package
that is in releases.

While the practical relevance is likely close to zero
(who would install this package without already having
firefox installed?) it is easy to fix by changing the
order of the dependency alternatives.