#879627 Both Firefox and Thunderbird lost their scrollbar arrows; other gtk3 apps did not

Package:
firefox
Source:
firefox
Description:
Mozilla Firefox web browser
Submitter:
Anthony DeRobertis
Date:
2017-10-23 16:51:12 UTC
Severity:
normal
#879627#5
Date:
2017-10-23 16:49:23 UTC
From:
To:
Both Firefox and Thunderbird have lost their scrollbar arrows. Other
gtk3 apps (such as Evince) continue to have them, I'm using the
TraditionalOk theme which has them.

I tried Thunderbird in safe mode and same problem.