UPDATING three year old review since this add-on wasn't really updated to solve any issues/missing features I complained about, years ago.

Changing my rating from 5/5 to 1/5 for three reasons:

- WARNING: Some sites don't function at all and the culprit is, usually, this add-on for me. So make sure to disable this on sites where things aren't functioning well (bank sites, for example).

- Three years later, STILL no Firefox sync of site lists, nor is there any option to export the site lists. So if you fresh install Firefox, kiss your custom curated lists of thousands of websites goodbye. Considering this add-on breaks a lot of sites, enjoy going through all of them and troubleshooting.

- This add-on hasn't been updated in 4 years, so I'm not expecting these issues to be fixed or add-on to be improved. So no point in rating it high when it's functionally broken in many ways and working on only few sites.