Vertical monitor leads to fingerprintable default screen size

When starting TBB 3.5.3 with a vertically oriented monitor, my default window size is highly identifiable - even though it is rounded to 100px. (size is 1000x1700x24)

Deleting the tor_browser directory and extracting a new version did not fix this issue.

Attempting to resize the window manually leads to odd (not round) values that are also identifiable.