Bug#819371: Please depend on "firefox | firefox-esr" rather than the reverse

[Jeremy Bicha]

I apologize for not commenting more recently, but chromium-browser has
been an alternative dependency in gnome-core since relatively soon
after Antonio's comment.

I think Epiphany is not because the Debian Security team does not
offer security support for webkit2gtk in Debian stable releases.
There's a chance that could change for Debian 10 "Buster" and
webkit2gtk is well-maintained in Debian Testing, so maybe it's worth
reconsidering.

As for the original bug here, I think the ordering of firefox-esr over
firefox reflects the intent of the Debian Firefox maintainer. The
firefox package is completely unsupported in Debian Testing (it won't
receive any updates). I don't want someone to accidentally figure that
out when they try to do an unsupported downgrade from Unstable to
Testing.

Thanks,
Jeremy Bicha