If LibreOffice Viewer having a funcfion to quit via long-press back button anyway, then it would giving conviniences to users.
Steps to Reproduce:
User Profile Reset: No
User-Agent: Mozilla/5.0 (Android 5.1.1; Mobile; rv:59.0) Gecko/59.0 Firefox/59.0
Changing to enhancement.
@Mert, what do you think ? is it something doable?
Yes it is totally doable
(In reply to Mert Tumer from comment #3)
> Yes it is totally doable
Thanks for checking ;-)