1308124 - css styles not applied to option elements of select when multi-process is enabled

Status: RESOLVED DUPLICATE of bug 910022

(Firefox :: Untriaged, defect)

Description

[u581154]

Attachment: ff_optcss.png

User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0
Build ID: 20160922113459

Steps to reproduce:

1. make sure multi-process is enabled
2. load jsfiddle: http://jsfiddle.net/ubm6vd3r/
3. run the example
Note: the jsfiddle is an example I randomly selected to demonstrate the problem.


Actual results:

the css style for the dropdown list option elements is not applied, i.e. the background-color in this example remains default.


Expected results:

the background-color should match the css style.
Works fine if multi-process is disabled. Please see attached screenshot. Firefox version is 49.0.1 on Windows. Also applies to Firefox 49.0 on macOS.