[daleharvey]

Its worth mentioning that Firefox OS and Desktop Firefox share gecko, a huge amount of the improvements for Firefox OS will be relevant for desktop, Especially regarding the performance and memory improvements.

(Also that there are definitely still people working on improvements solely to desktop, see the upcoming redesign)

[ksec]

Yes, but not everything is applicable to Desktop Firefox. And the porting back takes time. We have already been told dont expect e10s until early 2015. That in Mozilla calendar is telling me it will be around by the end of 2015.