You're quite right about SSE support being removed in ESR 52.0. For
completeness, we also no longer support OS X 10.6 - 10.8, and Linux using
GTK less than v3.4.

Cheers,
Nick Thomas
Mozilla Release Engineering

On 15 June 2017 at 02:39, Nick Boyce <[email protected]> wrote:

> On 13 June 2017 at 21:04, Ritu Kothari <[email protected]> wrote:
> >
> > On Tue, Jun 13, 2017 at 9:49 AM, Harrison Turley <
> [email protected]> wrote:
> >>
> >> With the planned released of FF ESR 52.2.0 today (6/13/17),
> >> I was curious if the 45.9.0 branch will automatically update
> >> with its end of life or if end users will need to install the
> >> ESR 52 branch to receive further updates.
> >
> > Firefox ESR45.9.0 users will be offered automatic updates
> > to Firefox ESR52.2.0.
>
> For completeness, you should add
>
> "... except for those people still running machines with Pentium 3 or
> AMD Athlon XP CPUs - these CPUs lack support for SSE2 instructions,
> and Mozilla has decided to stop building Firefox for the Windows
> operating system on such machines, so 45.9.0ESR is the last build that
> will ever be released for such hardware running Windows.  Note that
> Firefox still works perfectly well when the hardware does not provide
> SSE2 instructions, but you'll have to either build Firefox yourself
> using a suitable compiler (and set the build options suitably) or
> switch to a Linux distribution that builds Firefox without the need
> for SSE2 (most still do so)."
>
> https://support.mozilla.org/en-US/kb/your-hardware-no-longer-supported
> http://forums.mozillazine.org/viewtopic.php?f=42&t=2953859
>
> This seems to be primarily a Windows thing - apparently, Windows 7 is
> the last Windows version to run on CPUs lacking SSE2 support.
>
> PS: Yes, I know I'm the only person left on the planet with an "Athlon
> XP inside" machine in a cupboard :) .... A 2GHz single-core 32bit CPU
> with 2GB of RAM still works well for quite a few applications ...
>
> Cheers
> Nick Boyce
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