Really useful, the idea is really great, but the execution could be better. I've hit some strange bugs such as not being able to get back to a tab.

Also, the whitelist is poorly done. The matching is incorrect. Despite writing the domain name to whitelist correctly, it expected me to write the "www" in front of it. Some other time I written a whitelist, but some other domain also got whitelisted because the matching is incorrect. An entry such as "example.com" should whitelist the domain, and the whole domain. "an.example.com" should only whitelist the subdomain and nothing else.