Starting in Firefox 57....

Adblock Plus will be considered a "legacy" add-on and won't work starting with FF57, UNLESS the developers of Adblock are transitioning to the new technology. Well guys, are we "transitioning" or what?????
https://support.mozilla.org/en-US/kb/fi ... =inproduct
https://support.mozilla.org/en-US/kb/fi ... =inproduct