BACKUP YOUR BOOKMARKS! I installed this, moved bookmarks into the private bookmarks area, then locked it. Came back the next day and unlocked it only to find all the private bookmarks EMPTY!

I had a backup, but if I hadn't all my private bookmarks would have been lost!

I use Firefox sync, and I read the description before installing and using it too.

The github issue tracker is full of issues and bugs. My advice, avoid, look elsewhere.