I’m not sure how clicking can be considered “power user”… Had I said “just install tree style tabs, it’s much better”, you might’ve had a point, but you’re arguing that clicking is worse than hovering. Really can’t agree with you.
But hey, I don’t give money to Mozilla and the chance is very low that I ever will, so they can do what they want. If they think this is how they want to spend the 500 million they get from Google, that’s their prerogative.