There are several SDK APIs which are unavailable for Android: https://developer.mozilla.org/en-US/Add-ons/SDK/Tutorials/Mobile_development#Module_Compatibility
I there a target to complete these? Which ones are likely or unlikely to be developed and in what sort of timescale? I understand the UI ones are tricky!
I wanted to use the SDK/clipboard a while ago and found a bug for that: https://bugzilla.mozilla.org/show_bug.cgi?id=789757
Should there be bugs for the others? SDK/places/bookmarks for example?