yesterday i lost almost 4k bookmarks, for a first time using this addon for maybe year or more. didn't realize this could happen, so it kinda hurts. usually i did backups of all bookmarks from onetab after i reach certain point, 2-3k bookmarks or so, and delete them after from addon, but not this time. oh well. as a person below mentioned 'it good when it works', be careful, and do frequent backups