Dear Kovid,
1) The visited link color now is black (same color as normal text), should be red or something? As far as I remember, it was red.

(Book Details window)
2) Is it possible to have the cover width/height automatically stretched to width/height of the device on portrait and landscape mode, respectively? (Several cover images are now much smaller (resolution) than the Android screen).

(Book Details window)
3) A vertical scroll bar now appears on the screen while reading (required me to tap OK without the 'Show a scrollbar' ticked to deactivate it). But it seems you have fixed it already.

(reading on page mode)
4) I took your advice on the other thread to apply
.book-content-popup-container * {display: block;} to overwrite the footnote hiding, but it doesn't have any effect, hence, the pop-up is still blank.

(user defined css in Styles window)