iCloud Bookmarks by Apple Inc.

Keep your Firefox bookmarks on Windows up to date with your Safari bookmarks on iPhone, iPad, and Mac with the iCloud Bookmarks extension for Firefox.

iCloud stores your website bookmarks, so they are everywhere you go — on your iPhone, iPad, Mac, and PC. So when it comes to your devices, you can switch things up without mixing things up.

Note:
iCloud Bookmarks extension requires iCloud for Windows.