OneTab destroyed all my saved links in the past (about 2k links for 2 years) without any notice. When I look for old links, it's emptied. I've looked for store.js (json) as their information form OneTab websites, it's gone, the store.js file in browser-extension-data was disappeared too.
Avoid use this extension to prevent your pain.
CAUTION: They didn't update this extension for 1 year.