I just downloaded this extension and within 5 minutes have decided it's fabulous! I read the negative reviews first, and my conclusion is those people didn't read the tips/instructions. It was helpful to know not to click the red x, and I agree, a confirm delete warning would be a useful addition (if it doesn't yet exist - not going to click to test just in case). I'm finding the interface is fairly intuitive and I like the duplicate tabs feature. I knew I needed to get my tabs cleaned up and under control but I was stunned to see I had well over 2,000 tabs open so I've already nuked a bunch of them. I see there hasn't been any update for over a year - I hope the developer will keep this extension up to date! Thanks for a great tool!