have been using it for years!

Used to work perfectly. Now, even with an icloud update this morning to 7.20, the extension no longer works. Just keeps telling me to install the extension (which is already installed) and won't allow the sync bookmarks box to be checked and applied. Tried removing and reinstalling the extension and it still won't work. Spoke with AppleCare, and they said it's not on their end. Very sad, as I've happily used this, and it worked perfectly, until about a month ago.