Right now we write to disk with a 1500ms deferred task, which is the default for JSONFile.jsm. This is problematic when add-ons spam the storage API in terms of IO volume, as per the last few comments in bug 1419053. IMO we could easily choose to write less frequently (tripping a more immediate write on shutdown if necessary), like once every 30 seconds or whatever. Shane, does that sound reasonable?

This code is all going away in the very near future.

(In reply to Kris Maglione [:kmag] from comment #1) > This code is all going away in the very near future. Is there a bug open for this?

(In reply to Marco Castelluccio [:marco] from comment #2) > (In reply to Kris Maglione [:kmag] from comment #1) > > This code is all going away in the very near future. > > Is there a bug open for this?

We're moving the back-end of storage.local to indexedDB (see bug 1488825) -- but that ran into a (at least?) DOM-related issue that could cause migration failure which had no ETA, so we ran a study to see how prevalent that might be on a larger audience than Nightly (bug 1502111). The decision on 1488825 should be made within the month.