===blockers===
* what about this one? I'd advise either taking {{Bug|1024835}} or do a separate bug for the background work. What do you think?
*: (Oleg) I think it's not really actionable, I'd rather not include it into sprint. About background work... I see you think we'll have to do something similar for the {{Bug|1024835}}, or we still need another bug for the background work?
*: (Julien) I'd do a separate bug so that we can make it 2.0+ without needing to uplift the whole {{Bug|1024835}} (which could not be 2.0+). Danger is to do the wrong or too much background work ;) So maybe we should just take {{Bug|1024835}}...
*: (Oleg) 1024835 looks much more actionable, I'd rather take it to the sprint (even that I can repro it :) ) But this work will be definitely needed, so there is a low risk that we'll waste time
*: (Julien) ok, let's take 1024835 then :)
* 2.0+ {{Bug|1022575}}: https://bugzilla.mozilla.org/show_bug.cgi?id=1022575
