Only in Firefox (works fine in Chrome)

When you select an image and type a height in the field in the ribbon, this value is assigned to the width instead.
For example, I have a 140x250 pixels image, I type "150" instead of the 140 and press enter, and the image becomes 84x150 pixels.
This does not occurs when clicking the spin buttons on the field.
This only occurs when you press "enter" after setting the value, if the field loses focus the height is correctly set.