My Favourite Add-on. Thank you for the updated add-on and for releasing it so quickly after Firefox 57. It works well on Windows 7 and everything still works the same for me. I never did use the shortcut keys as I always right-clicked and went from there. No problems finding my old clippings. Very easy to use. This add-on is definitely a keeper.
The Mozilla team is rolling out a fix for Firefox which should resolve the certificate issue affecting all add-ons. See their Twitter feed for details: https://twitter.com/mozamo/status/1124627930301255680