I realize this is an old thread, but I wanted to drop by and explain WHY none of the bookmark sync extensions work right with Opera.

All Chrome-based browsers, including Opera, have two 'special' bookmark folders defined: 'Bookmarks Bar' and 'Other Bookmarks'. Bookmarks Bar is self explanitory; it's the folder for the tollbar. Other Bookmarks is the dropdown menu. Extensions may add additional folders, but they won't show up in Chrome's UI.

Opera took a slightly different approach when making their UI. Instead of using Other Bookmarks for everything not in the toolbar, they use it for IMPORTED bookmarks. They then made several additional folders for your bookmarks, shared bookmarks, and a few of the other default folders.

What does this mean for bookmark syncing extensions? It means that Opera is storing it's bookmarks in folders the extensions don't know anything about, so they don't get synced.

I love that Opera supports web notifications, but it's a bit disappointing that it doesn't use the native notification system (libnotify). The built-in notifications are really out of place on my desktop. Does anyone know of a way to get opera to use the native notification system (via plugin or setting)?