Firefox 52で重いって言ってた人、実は HTTP/2 は直接の原因ではなくて↓なんじゃないの？

https://mail.mozilla.org/pipermail/gofaster/2017-March/000655.html
> Ad networks are seeing lots of duplicate impressions coming from Firefox
> 52 due to predictive prefetch (see https://bugzilla.mozilla.org/
> show_bug.cgi?id=1349921 and https://bugzilla.mozilla.org/
> show_bug.cgi?id=1350005 and https://bugzilla.mozilla.org/
> show_bug.cgi?id=1350032 for the details).
>
> The system add-on to disable predictive prefetch is being tracked in
> https://bugzilla.mozilla.org/show_bug.cgi?id=1351082 for Firefox 52 and
> 52 ESR. The predictive prefetch feature will be disabled on Firefox 53 and
> 54 through the regular change process, and is targeted to be fixed in
> Firefox 55.