This extension worked for a few days, but stopped completely without any error messages. I use it with Internet Explorer, Firefox and Google Chrome on my Dell Inspiron 7558 running Windows 10, as well as Safari on my iPhone 6s. I didn't want to have to remove the extensions on Google Chrome and Firefox to turn iCloud bookmarks sync off and back on, so I just turned it off and back on for Internet Explorer. I hope this works! If not, I'm taking this up with the Apple Store at the Willow Grove Park Mall just off State Highway 611 in Willow Grove, Pennsylvania!