Firefox Extension Development - Data Storage - is Firefox Preferences a good place?

Question

I have developed a Firefox add-on that needs to save some user-data in the local machine. Right now, I use the filesystem functionality that Firefox provides to create some

Answer 1

It is possible to locate the profile or extensions directory of firefox via code. You can even locate the directory of your own extension. Portability shouldn't be a problem using this approach.

You can find instructions at the MDC (File I/O).

I wouldn't advice saving data in the preferences. Anyway, instead of using bare file i/o you may look into sqlite-databases - ubiquity uses those as well.

Cheers.