1343464 - "override colors specified by the page" has problems

Status: RESOLVED WORKSFORME

(Firefox :: Settings UI, defect)

Description

[Lu Wei]

Attachment: amazon.JPG

User Agent: Mozilla/5.0 (Windows NT 5.1; rv:51.0) Gecko/20100101 Firefox/51.0
Build ID: 20170125094131

Steps to reproduce:

I'd like to replace the white background with a greenish color. 
Options->Content->Colors...->Background, select a light green color, "Override the colors..." select "Always".


Actual results:

The page background changed, but with some other elements disappeared, or changed appearance. As the attached screen shot, Amazon: banner, cart icon, search button, category icon "<",  star indicator, etc are gone.


Expected results:

Only page background color should change.

Comment 1

[Lu Wei]

Attachment: screen shot

URL is https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=router

Comment 2

[:Gijs (he/him)]

There's no way for Firefox to know whether CSS that specifies a background image should be overridden or not. Because this is first and foremost an accessibility-related setting, it errs on the side of caution and overrides everything, including CSS background images. This is expected.