Both a tree-view tabs and grouping when using title-tabs would be welcome. I'd personally want a tree/vertical tabs option. Got used to them now that I've been using Edge because Youtube lags on Firefox after watching it for a while.
I should mention that this does not really happen on my desktop computer. Only the laptop. It's a Vivobook with an integrated GPU so that might be the problem. The thing is: this really does not happen with Edge.
Very slow. Changing to other windows besides Firefox or changing tabs causes the youtube tab to go blank and render again after a very long time. Video controls start lagging and once my laptop even crashed during a video. Had to hard restart the who...