Finally, the more efficient implementation of localStorage DOM API has landed and sticks in Firefox 23, currently on the Nightly channel. The first build having the patches has id 20130416030901.

More about the motivation and details in my previous post on DOM storage code overhaul.

I want to thank all involved people, namely Vladan Djeric, Marco Bonardo and Olli Pettay for their help, ideas and mainly reviews of this large change. Thanks!