Is there a Javascript library for localStorage to emulate SQLite

I have an application which uses SQLite for storage. We need to change it to enable it to work with Firefox and other browsers.

LocalStorage seems to be the choice. However, localStorage does not offer the more complex sql functionality (for example OrderBy, GroupBy, table joins etc.).

Would anyone know of a Javascript existing library that would work with localStorage and make it behave more like SQL? -Thank you