That's awful. This is one of the reasons I use Firefox, because its UI is customisable and not massive.

Mozilla seems to be intent on taking away the power user features. I didn't even know this redesign was coming, but those screenshots look horrendous. Why are the tabs "floating" as giant blobs? The current design looks much more cohesive and less distracting.

Sad to see Firefox succumb to the "must design everything every few years" mentality.