It’s a background splash color that, when you load images, is the default for Firefox.

Seems to me, however, that it could be done in the settings instead.  Although I looked and don’t see it in mine.

Example:



> On Aug 10, 2016, at 1:15 PM, Iznogoud <iznogoud at nobelware.com <mailto:iznogoud at nobelware.com>> wrote:
> 
>> 
>> I recently compiled Firefox to avoid the dark background (darknoise) 
>> when opening images. 
> 
> Can you elaborate on just this?
> 
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