www.msn.com - see bug description

[softvision-oana-arbuzov]

URL: http://www.msn.com/en-us/autos
Browser / Version: Firefox Mobile Nightly 56.0a1 (2017-06-19)
Operating System: LG G5 (Android 7.0) - Resolution 1440 x 2560 pixels (~554 ppi pixel density)
Problem type: Something else - I'll add details below

Steps to Reproduce

1. Navigate to: http://www.msn.com/en-us/autos
2. Observe drop-down menus.

Expected Behavior:
Single arrow is displayed.

Actual Behavior:
Two arrows are displayed.

Note:

1. Reproducible on Firefox 54.0 Release.
2. Not reproducible on Chrome (Mobile) 58.0.3029.83.
3. Screenshot attached.

Watchers:
@softvision-sergiulogigan
@softvision-oana-arbuzov

sv; country: in

From webcompat.com with ❤️

[MDTsai]

Duplicate of https://bugzilla.mozilla.org/show_bug.cgi?id=1368555

[softvision-oana-arbuzov]

Duplicate of #7612 . Closing this one.