I don't think it's entirely unfair -- both sets of numbers have their
place. OS X is an important platform, but it's also true that these older
OS X releases represent a tiny portion of our overall userbase.

For a few more data points...

Back in Firefox 16 when we dropped 10.5 -- another long-lived and popular
release -- those users represented 17% of our OS X users (or 0.78% of
overall userbase). Dropping 10.6 - 10.8 is about 1.5x the impact
(percentage wise), and so we should think carefully about that, but it's
not significantly out of character for what we've done before.
https://groups.google.com/d/msg/mozilla.dev.platform/aT7hy7YDdqA/j2O0bUnuYMEJ

When we dropped 10.4 (early in the Firefox 4.0 cycle, about a year before
release), it represented 25% of 3.5 users and 17% of 3.6 users. (I don't
see a overall userbase number in the thread.)
https://groups.google.com/d/msg/mozilla.dev.planning/fTpkdYa6uZM/9aPn58hvVa8J

And waaaay back when we dropped 10.3 (for FF3.0), it represented 16.5% of
OS X users, 0.69% of total user base.
http://groups.google.com/group/mozilla.dev.planning/msg/c19ecb46e27dbf91
http://groups.google.com/group/mozilla.dev.planning/msg/4bd908b72a5e0759

One thing all of these threads show is that there's a lot of noise and
handwringing and doomsayers when we broach the topic of dropping support
for an OS X release. :)

Justin

On Thu, Mar 10, 2016 at 2:25 PM, Mike Hommey <m...@glandium.org> wrote:

> On Thu, Mar 10, 2016 at 01:03:43PM -0500, Benjamin Smedberg wrote:
> > This is notice of an intent to deprecate support within Firefox for the
> > following old versions of MacOS: 10.6, 10.7, and 10.8
> >
> > The motivation for this change is that we have continued failures that
> are
> > specific to these old operating systems and don't have the resources on
> > engineering teams to prioritize these bugs. Especially with the
> deployment
> > of e10s we're seeing intermittent and permanently failures on MacOS 10.6
> > that we are not seeing elsewhere. We get very little testing of old MacOS
> > versions from our prerelease testers and cannot dedicate much paid staff
> > testing support to these platforms. We also have an increasingly fragile
> set
> > of old hardware that supports automated tests on 10.6 and do not intend
> to
> > replace this.
> >
> > This will affect approximately 1.2% of our current release population.
> Here
> > are the specific breakdowns by OS version:
> >
> > 10.6
> >       0.66%
> > 10.7
> >       0.38%
> > 10.8
> >       0.18%
>
> It's unfair to mention those populations by percentage of the global
> Firefox population. What are those percentages relative to the number of
> OSX users? ISTR 10.6 represented something like 25% of the OSX users,
> which is a totally different story (but maybe I'm mixing things with
> Windows XP).
>
> Mike
> _______________________________________________
> firefox-dev mailing list
> firefox-...@mozilla.org
> https://mail.mozilla.org/listinfo/firefox-dev
>
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