Getting updates published on the Firefox add-on site takes a few weeks [1], and as I understand it (haven't needed to do it myself recently) queuing a new version bumps you all the way to the back of the line. If the add-on needs to update non-code things (such as what sites to block) on a shorter time frame having its own service is pretty necessary.
See also the various lists adblock plus / uBlock / lightbeam use. Or for that matter the safe browsing lists Mozilla uses instead of shipping it in a new version of the app.
(I still don't use Ghostery because their relationship with the advertising industry freaks me out, but that doesn't mean I have to be critical of them about the list updates.)
See also the various lists adblock plus / uBlock / lightbeam use. Or for that matter the safe browsing lists Mozilla uses instead of shipping it in a new version of the app.
(I still don't use Ghostery because their relationship with the advertising industry freaks me out, but that doesn't mean I have to be critical of them about the list updates.)
[1] latest status update seems to be https://blog.mozilla.org/addons/2015/04/08/add-ons-update-63...