We need to make the tabs module e10s-compatible. At first glance, I think this just requires removal of the contentWindow and contentDocument accessors along with the three related event properties onReady, onLoad, onPaint. Benjamin: does that sound right? (See <https://jetpack.mozillalabs.com/sdk/0.7/docs/#module/jetpack-core/tabs> for docs on the API.) Dietrich: is this something you can take on?
If Warner and I get done with bug 567703 as early as we think we will, we can start working on this as one of the first modules to get ported to e10s-land.
The Add-on SDK is no longer a Mozilla Labs experiment and has become a big enough project to warrant its own Bugzilla product, so the "Add-on SDK" product has been created for it, and I am moving its bugs to that product. To filter bugmail related to this change, filter on the word "looptid".
The work for this bug is done in the linked dependency. One it's fixed this will be resolved automatically.