Re: Necko e10s specs

For those not following the WHATWG thread --- there's interest in adding 
an asynchronous transactional API for localStorage, but less interest in 
breaking compatibility with the existing API. There's quite a bit of 
discussion about what properties the transactional API should have.

Also it seems to me that the global storage mutex can be implemented 
with a per-domain mutex; we should be able to avoid all situations where 
script in one domain synchronously triggers script in another domain 
while holding the storage mutex.

Rob