Spent some time and to display images with EXIF orientation right inside edit view and crop view of gallery https://bugzilla.mozilla.org/show_bug.cgi?id=989026#c3, point 1
the fix should handle below scenarios not covered by  simply changing 'edit-preview-area' with css transform.  
Inside image editor,
a) click of edit-effect button should show thumbnails with effects rotated.
b) click of edit-crop button should handle aspect ratio and crop handles as per roated image.

Unless there is an easy fix for above,  I propose to updated scope of bug https://bugzilla.mozilla.org/show_bug.cgi?id=989026#c3, point 2