QF23 summary

[classilla]

https://ehsanakhgari.org/blog/2017-09-07/quantum-flow-engineering-newsletter-23

https://bugzilla.mozilla.org/show_bug.cgi?id=1396870 (and related bugs https://bugzilla.mozilla.org/show_bug.cgi?id=1369317 -- pretty much should apply as is -- and followup https://bugzilla.mozilla.org/show_bug.cgi?id=1396982)

https://bugzilla.mozilla.org/show_bug.cgi?id=1393098

This may or may not work. Some of the code is present, though.
https://bugzilla.mozilla.org/show_bug.cgi?id=1371908 (JS)

This could be risky, but could definitely be beneficial:
https://bugzilla.mozilla.org/show_bug.cgi?id=1390660

[classilla]

1390660 requires some later, possibly binary compatibility-breaking, changes to XPCOM to have any noticeable effect. I'm not willing to implement these. Nothing else to do here.