I also want to highlight the thing at the end of the gist linked above
- the majority of the non-SSE2 population are on 43.0.4. That is,
they're keeping up-to-date, and would likely be affected by this more
than somebody stranded on an old version.

On Fri, Jan 29, 2016 at 3:29 PM, Chris H-C <chut...@mozilla.com> wrote:
> tl;dr - Around 99.5% of Firefox Desktop clients on release channel
> represented by (a 20% sample of) pings submitted by on January 21, 2016 had
> "hasSSE2" detected.
>
> Here's the analysis and results on github. Please feel free to check my
> work: https://gist.github.com/chutten/4959c873d7fbbec0785a
>
> Keep in mind we cannot prove a negative from this. I cannot state that
> those pings without hasSSE2 correspond to clients that don't have SSE2
> support on their machines. So I tried (and failed, see bottom section of
> that gist) to keep analysis and discussion centred on the "hasSSE"
> population alone.
>
> :chutten
>
> On Fri, Jan 29, 2016 at 2:44 PM, Mike Hoye <mh...@mozilla.com> wrote:
>
>> On 2016-01-29 2:05 PM, Cameron Kaiser wrote:
>>
>>> On 1/29/16 9:43 AM, Ashley Gullen wrote:
>>>
>>>> FWIW, the Steam Hardware Survey says 99.99% of users have SSE2 (under
>>>> "other settings"): http://store.steampowered.com/hwsurvey
>>>>
>>>
>>> For that to be valid, one must assume that the population of Firefox
>>> users and Steam users are sufficiently similar. I don't think that's
>>> necessarily true since most Steam titles have substantially higher system
>>> requirements.
>>>
>> While that's a fair point, Microsoft turned compiling with SSE2 on by
>> default in Visual Studio in 2012, and it's been basically impossible to buy
>> an x86 CPU without it since...  2004 or so?
>>
>> I've tapped chutten about this, and he says:
>>
>> 14:33 < chutten> Easy as pie. ping["environment/system/cpu/extensions"]
>> contains "SSE2"
>> 14:33 < chutten> or, rather, the inverse
>>
>> ... which he then explained to me means "we can get our own data in short
>> order."
>>
>> He says it'll be straightforward to pull in, so he's going to do that.
>>
>>
>> - mhoye
>>
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