Fixed
- A pop-up window (one a site opens) looks like one: no sidebar button (there's
no sidebar to show) or extensions menu (its extensions are hidden there), the
address row in the window's colour like the title row above it rather than a
strip of its own, and the read-only address no longer lights up under the
pointer as if it could be typed in
(#482, thanks @OneGunBullet).