worked very well until i updated to ff 57. totally loved it when it worked.
since updating to 57 my history and database are empty. and sadly no more "watched" videos.
when click on "synchronize" in the history-options a unclickable message saying "synchronizing with history" appears but nothing else happens until i reload or close the tab.
the search wheel at the buttom right is constantly turning but not finding anything.
already tried reinstalling the addon, overinstalling the browser and restarting the mac (os 10.12.6). it's just not working anymore.
on my older mac with el capitan this great addon strangely still works under ff 57.
any ideas?