This extension has been great so far and works exactly as described for me. I do have one thing to note. I discovered today on zen browser that a few random videos opened into new tabs are in mixes(particularly ones that have been watched before and had a red bar underneath). Never saw that before on zen but it also isn't my main browser and I've never noticed that problem while having this extension on ungoogled chromium. I rolled back to 3.1 and tested this out and it was still happening so just thought I'd drop that info here. Overall a minor thing. Either way it's a great extension that gets rid of all those unnecessary mixes as advertised.