Much as the last recent review, I also have been receiving the "The storage service encountered an unexpected error. Please wait a few minutes, restart your browser and try again." It seems to have 'frozen' the blacklist. No changes I make to the blacklist, whether it be adding or removing, seem to stay. It's been a few days since it started, and not even hitting clear all seems to do anything. When reloading the page it remains the same as before. This is my most used browser extension so I look forward to a fix! 5 star nontheless, considering this is the first time I've ever had an issue with it.

Edit: Disabling the cloud sync option, like suggested, fixed my issue